From space, the Earth looks like a blue marble.
Most of the blue is ocean, the green is land, and a layer of air, the atmosphere, wraps around it.
With water, a mild temperature, and air to breathe, it is a home for people, fish, and plants.
Explore Earth from space and find the ocean, land, and air.
Let's See Earth from Space
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Earth from space showing oceans, land, and atmosphere
🌍 Earth, the Blue Marble!
①Earth looks blue from space
②Most of the blue is the ocean (70%!)
③Green areas are land (30%)
④A layer of air wraps around Earth too
What is on Earth?
🌊 Water — Source of Life
①Water is in oceans, rivers, and lakes
②Water lets fish, plants, and people live
③Life is hard on planets without water
💨 Air — The Invisible Blanket
①The layer of air around Earth is called "atmosphere"
②It contains oxygen we breathe
③It protects Earth from dangers in space
④Other planets do not have this kind of air!
🌿 Land — Where We Live
①Mountains, fields, deserts, forests
②Plants grow and animals live on the soil
③Homes, schools, playgrounds are all on land
Earth's Special Features
⭐ Why Earth is Special
①Has water — rare on other planets
②Has the right temperature — not too hot or cold
③Has air — we can breathe
④These three let life exist!
Summary
🎯 Earth Summary
①Earth is 70% ocean and 30% land
②Atmosphere wraps around Earth
③Water + right temperature + air = life
④Earth is our precious home — protect it!
Examples and Unit Test
Example 1
From space the Earth looks like a blue marble. How much of the Earth is ocean and how much is land?
1
From space, most of the blue part of the Earth is ocean.
2
Ocean covers about 70% and land covers about 30%.
▸ Ocean about 70% · land about 30%
The Earth looks blue because the ocean is so wide.
Example 2
Why can living things live on Earth? Name three reasons.
1
The Earth has water and a right temperature that is neither too hot nor too cold.
2
It also has air to breathe, an atmosphere that wraps around the Earth.
▸ Water + the right temperature + air: these three let living things live
With water, temperature, and air all together, the Earth is a very special planet.
Unit Test
Which is NOT a condition that lets living things live on Earth?
①It has water
②It has the right temperature
③It has air to breathe
④Land is much wider than the ocean
⑤There is water in seas, rivers, and lakes
▸ ④ Land is much wider than the ocean
1
The Earth has water, the right temperature, and air, so living things can live.
2
The Earth's ocean (about 70%) is wider than its land (about 30%), so ④ is wrong.