Land and water are the same all over the Earth.

Land can be high, low, rocky, or farmland.

The surface of the Earth has different shapes called landforms.

Two thirds of the Earth are covered with land.

The sea is blue because it reflects the color of the trees.

A continent is a large piece of land surrounded by oceans.

Islands are very high lands.

A valley is a lower land than its surroundings, plains, hills, or mountains, and shaped by rains.

Desert is a very dry landform that is covered with sand.

A piece of land that has water all the way around is called an mountain.

Asia is the biggest continent and Africa is the smallest.

Australia is a continent and also an island.

North America is the coldest continent on Earth.

Arabs speak Arabic but have different dialects, which mean they speak Arabic in different ways.

Arabs have only one way of writing and that is standard Arabic.

Pollution is to make anything dirty.

Pollution does not harm humans, animals, and plants.

We need clean water to be used today and in the future.

People should not protect water.

People, who work in factories, should make the water they throw away clean before it is thrown into rivers and seas.

Smoke and gases pollute the air and make it dirty.

Smog is formed when smoke and log are mixed together.

Earth is the name of the planet we live on.