UNIT 1. PLANET EARTH

1.1. LIVING EARTH

A planet is an object that travels around, or orbits a particular star.

The Earth is one of nine planets that orbit the Sun. Together they make up our Solar System.

Revolution Around The Sun

EARTH’S ROTATION• As each planet moves, it also spins around

on its own axis (an imaginary line running through the planet).

• EARTH ROTATION

Earth is the third planet from the Sun. It is the only known planet with the right conditions

to support living things, although scientists are searching for life on other planets.

Earth is the third planet from the Sun.

It is the only known planet with the right

conditions to support living things,

although scientists are searching for life on

other planets.

The Earth's distance from the Sun means that it

receives just the right amount of heat and light.

Its combination of gases enables plants, animals

and people to breathe, and it is warm enough for

water to exist as a liquid.

All these things are essential for life

on Earth.