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W-70 What Is Rain?
Rain comes from the sky.
Rain is water.
Water is in the air.
The air has water vapor.
Water vapor is very light.
Water vapor goes up.
The sky has clouds.
Clouds hold water.
Small water drops j...
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2
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W-63 What Is Wind?
Wind is moving air.
Air is all around us.
Air can move fast.
Air can move slow.
The sun heats the air.
Hot air moves up.
Cold air moves down.
Air moves to fill space.
This moving air is wind.
...
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3
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W-64 What Is Snow?
Snow comes from the sky.
Snow is frozen water.
Water is in the air.
The air has water vapor.
Cold air makes water freeze.
Water vapor becomes ice.
Ice forms small crystals.
These crystals join ...
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4
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W-69 Why Is the Sky Blue?
The sky looks blue.
Light comes from the sun.
Sunlight is white light.
White light has many colors.
Light moves through the air.
The air has small parts.
These parts scatter light.
Blue light s...
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5
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W-69 What Is a Cloud?
A cloud is in the sky.
A cloud is made of water.
Water can be very small.
The air has water vapor.
Water vapor goes up.
High air is cool.
Cool air changes vapor.
Vapor becomes tiny drops.
Drop...
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6
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W-70 How Does Rain Fall?
Rain starts in the sky.
Clouds are full of water.
The water is very small.
Small drops meet each other.
They join and grow bigger.
Big drops become heavy.
The air cannot hold them.
The drops st...
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7
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W-72 Why Is It Hot in Summer?
Summer is a warm season.
The sun gives heat.
The Earth moves around the sun.
The Earth also tilts.
In summer, our place tilts to the sun.
The sun stays longer in the sky.
Sunlight hits the groun...
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8
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W-75 Why Is It Cold in Winter?
Winter is a cold season.
The sun gives heat.
The Earth moves around the sun.
The Earth also tilts.
In winter, our place tilts away from the sun.
The sun stays lower in the sky.
Sunlight hits the...
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9
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W-71 What Is Fog?
Fog is in the air.
Fog is made of water.
The water is very small.
The air has water vapor.
Cool air changes vapor.
Vapor becomes tiny drops.
These drops stay near the ground.
They float in the ...
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10
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W-56 What Is Ice?
Ice is frozen water.
Water can change form.
Cold makes water freeze.
The air can be very cold.
Cold air takes heat away.
Water loses heat.
Water becomes hard.
This hard water is ice.
Ice feels...
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11
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W-61 How Do Clouds Move?
Clouds move in the sky.
Clouds are in the air.
Air can move.
Moving air is wind.
Wind pushes the clouds.
Soft wind moves clouds slowly.
Strong wind moves clouds fast.
High clouds move faster.
...
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12
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W-62 Why Do We See Rainbows?
Rainbows come from light.
Light comes from the sun.
Sunlight looks white.
White light has many colors.
Rain falls from the sky.
Rain has small water drops.
Light goes into the drops.
The drops ...
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13
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W-59 What Is Sunshine?
Sunshine comes from the sun.
Sunshine is light.
Sunshine also has heat.
The sun shines every day.
Sunshine travels through space.
Sunshine reaches the Earth.
Sunshine hits the ground.
The groun...
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14
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W-66 Why Does Rain Stop?
Rain comes from clouds.
Clouds hold water drops.
The drops fall as rain.
Rain uses the water in clouds.
Clouds can run out of water.
Some drops fall away.
Some drops move to other places.
The a...
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15
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W-62 What Is Thunder?
Thunder is a loud sound.
Thunder comes from the sky.
Thunder happens in storms.
Storms have big clouds.
These clouds make lightning.
Lightning is very hot.
Hot air expands fast.
The air moves v...
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16
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W-58 Why Do Shadows Change?
Shadows come from light.
Light comes from the sun.
An object blocks the light.
The blocked light makes a shadow.
The sun moves in the sky.
Morning sun is low.
Shadows look long then.
Noon sun i...
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17
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W-61 What Is Daytime?
Daytime is part of a day.
Daytime is when it is light.
Light comes from the sun.
The sun is in the sky.
The Earth turns every day.
One side faces the sun.
That side gets sunlight.
This time is ...
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W-66 What Is Nighttime?
Nighttime is part of a day.
Nighttime is when it is dark.
The sun is not in the sky.
The Earth turns every day.
One side faces away from the sun.
That side gets no sunlight.
This time is nightti...
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W-64 Why Does the Sun Feel Warm?
The sun gives energy.
This energy is light.
Light travels through space.
Light reaches the Earth.
Sunlight has heat inside.
The heat touches our skin.
Our skin feels the heat.
Heat makes things...
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20
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W-78 What Is the Moon?
The moon is in the sky.
The moon is not a star.
The moon is a big rock.
The moon goes around the Earth.
The moon has no light of its own.
The sun gives light.
The moon reflects the light.
This ...
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21
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W-66 Why Does the Moon Change Shape?
The moon goes around the Earth.
The sun gives light.
The moon has no light.
The moon reflects sunlight.
Only part of the moon gets light.
We see the lit part.
The moon keeps moving.
Our view ke...
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22
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W-53 What Is Earth?
Earth is a planet.
Earth is our home.
Earth is in space.
Earth goes around the sun.
Earth spins every day.
Earth has land.
Earth has water.
Earth has air.
Air helps us breathe.
Water helps li...
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23
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W-66 Why Does Day Turn to Night?
Day turns to night every day.
The Earth keeps turning.
The Earth spins like a top.
One side faces the sun.
That side has daytime.
The other side faces away.
That side has nighttime.
The Earth k...
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24
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W-67 What Is a Star?
A star is in space.
A star is very big.
A star is very hot.
A star makes its own light.
The sun is a star.
Stars are far away.
They look small to us.
Stars shine at night.
Stars stay in the sk...
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W-58 Why Do We See Stars at Night?
Stars are always in the sky.
Stars make their own light.
The sun also makes light.
The sun is very bright.
Daytime has strong sunlight.
Sunlight hides star light.
We cannot see stars then.
Nigh...
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W-62 What Is Weather?
Weather is the air outside.
Weather changes every day.
The sun makes the day bright.
Rain falls from clouds.
Rain makes the ground wet.
Snow falls in cold air.
Snow makes the land white.
Wind m...
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W-58 Why Does It Rain More Some Days?
Rain comes from clouds.
Clouds hold water in the air.
Warm air goes up.
Warm air holds more water.
Clouds grow bigger.
Clouds get heavy.
Heavy clouds drop more rain.
Cold air holds less water.
...
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W-53 What Is a Season?
A season is a time of the year.
There are four seasons.
Spring comes after winter.
Spring has warm weather.
Summer comes after spring.
Summer has hot weather.
Fall comes after summer.
Fall has ...
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W-56 Why Do Seasons Change?
The Earth moves around the sun.
The Earth moves once each year.
The Earth is tilted to one side.
The tilt changes sunlight.
Some places get more sun.
More sun makes days warmer.
This time is sum...
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W-61 What Is Air?
Air is all around us.
Air is not easy to see.
Air is made of many gases.
Oxygen is one gas in air.
People need oxygen to live.
We breathe air every day.
Air goes into the nose.
Air moves to the...
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W-50 Why Do We Need Air?
We need air to live.
Air has oxygen inside.
Oxygen helps the body work.
We breathe air every day.
Air goes into the nose.
Air moves to the lungs.
The lungs take oxygen.
Oxygen moves into the bo...
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W-52 What Is Water?
Water is all around us.
Water is a clear liquid.
People need water to live.
Animals need water too.
Plants need water to grow.
We drink water every day.
Water is in rivers.
Water is in lakes.
...
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W-46 Why Does Water Freeze?
Water can change form.
Water freezes in cold air.
Cold air takes away heat.
Water loses heat slowly.
The water gets colder.
Cold water moves less.
The water becomes hard.
This hard water is ice...
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W-38 What Is Ice Made Of?
Ice is made of water.
Water is a liquid.
Cold air cools water.
Water loses heat.
Water freezes slowly.
The water becomes solid.
This solid water is ice.
Ice is hard and cold.
Ice melts in warm...
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W-36 Why Does Snow Melt?
Snow is frozen water.
Snow melts in warm air.
Warm air gives heat.
Snow takes in heat.
The snow gets softer.
The snow turns to water.
This change is called melting.
Melting happens on warm days...
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W-72 What Is the Sun?
The Sun is a star.
The Sun is very big.
The Sun is very hot.
The Sun is in space.
The Earth moves around the Sun.
The Sun gives light.
Light helps us see.
The Sun gives heat.
Heat makes Earth ...
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W-53 Why Is the Sun Important?
The Sun gives light.
Light helps us see.
The Sun gives heat.
Heat keeps Earth warm.
Warm Earth helps life live.
Plants need sunlight.
Sunlight helps plants grow.
Plants make food.
People eat f...
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W-71 What Is the Sky?
The sky is above us.
The sky is very big.
The sky looks blue in the day.
Light from the Sun fills the sky.
Clouds move in the sky.
Clouds are made of water.
Birds fly in the sky.
Planes fly in ...
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W-66 Why Does the Sky Change Color?
The sky changes color.
The Sun gives light.
Light moves through air.
Air is around Earth.
Daytime light looks blue.
Blue light spreads in the air.
The sky looks blue in the day.
The Sun moves l...
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W-55 What Is Earth Made Of?
Earth is our home.
Earth has land.
Land is solid ground.
Land has rocks.
Rocks are hard.
Land has soil.
Soil helps plants grow.
Earth has water.
Water covers many places.
Oceans have much wat...
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W-54 Why Is Earth Round?
Earth is round.
Earth is very big.
Earth has strong gravity.
Gravity pulls things in.
Gravity pulls from all sides.
The pull is the same everywhere.
This pull makes a round shape.
Earth was sof...
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W-49 What Is Land?
Land is part of Earth.
Land is solid ground.
People stand on land.
Animals live on land.
Land is not water.
Land has rocks.
Rocks are hard.
Land has soil.
Soil is soft.
Plants grow in soil.
...
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W-66 What Is the Ocean?
The ocean is part of Earth.
The ocean is very big.
The ocean is water.
The water is salty.
The ocean covers much of Earth.
Waves move on the ocean.
Waves are moving water.
Many animals live in ...
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W-59 Why Is the Ocean Salty?
The ocean is salty.
Salt is in ocean water.
Rain falls on land.
Rain moves over rocks.
Rocks have salt inside.
Water takes salt from rocks.
Rivers carry salt.
Rivers flow to the ocean.
Salt st...
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45
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W-57 What Is a River?
A river is water on Earth.
A river moves.
The water flows.
A river starts on land.
Rain makes river water.
Snow can make river water.
A river moves downhill.
The water moves slowly or fast.
A ...
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W-56 Why Do Rivers Flow?
Rivers flow on Earth.
Rivers are moving water.
Water moves because of gravity.
Gravity pulls things down.
Land is high and low.
Water starts on high land.
Water moves to low land.
This movement...
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47
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W-56 What Is a Mountain?
A mountain is land on Earth.
A mountain is very high.
A mountain rises from the land.
The top is called a peak.
The sides are steep.
Mountains are made of rock.
Rock is very hard.
Some mountain...
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W-57 Why Are Mountains Tall?
Mountains are tall land on Earth.
The land can move.
Big pieces of land push together.
The land goes up.
This makes mountains tall.
Some land breaks and lifts up.
The rock moves upward.
The mou...
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W-52 What Is Sand?
Sand is part of Earth.
Sand is very small rock pieces.
Sand comes from rocks.
Rocks break over time.
Wind breaks rocks.
Water breaks rocks.
The pieces get very small.
These small pieces are san...
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50
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W-47 Why Is Sand Dry?
Sand is on Earth.
Sand is made of small pieces.
These pieces are hard.
Water can sit on sand.
The Sun gives heat.
Heat warms the sand.
Water turns into air.
This is called drying.
Wind moves o...
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