Unit 1 The Earth

What are galaxies?

• Galaxies are a collection of nebulae.

• Galaxies are a collection of millions of stars.

• Galaxies are a collection of nebulae and millions of stars.

• Galaxies are balls of ice and dust.

Our galaxy is called

How many planets are there in our Solar System?

• 9

• 8

• 7

• 6

The layers of the Earth are

The crust

• is between the mantle and the core.

• forms the continents and the seabed.

• The hydrosphere and the atmosphere rest on it.

• is in the centre of the Earth.

The mantle is made up of

The core is made up of

The Moon

• is the Earth's satellite.

• pulls the Earth and creates the tides.

• takes 24 and a half days to rotates on its axis.

• takes 29 and a half days to rotates on its axis.

The Earth

• revolves around a star.

• revolves around the Sun.

• It takes 1 year and 6 hours around the Sun.

• It takes 1 hour and 6 minutes around the Sun.