Inside Our Earth

Like an onion, the Earth is made up of several concentric layers (one inside the other). What is the uppermost layer of Earth called?

• mantle

• core

• crust

The oceanic crust is only 5 km thick, and it is known as sima. Which minerals is it made of?

• magnesium and silver

• silica and alumina

• silica and magnesium

Which are the three main types of rocks ?

• igneous, extrusive igneous, intrusive igneous

• igneous, sedimentary, metamorphic

What is this process of one type of rock turning into another and back again called?

• rock transformation

• rock changes

• rock cycle

How many layers are there in earth?

• 3

• 5

• 2

And when igneous and sedimentary rocks are subjected to heat and pressure, which type of rocks do they change into?

• extrusive igneous

• metamorphic

• molten massives

The rock which is made up of molten magma is

• Sedimentary

• Igneous

• Metamorphic

The innermost layer of the earth is

• Core

• Mantle

• Crust

Rocks which contain fossils are

• Igneous

• Metamorphic

• Sedimentary

The thinnest layer of the earth is

• crust

• mantle

• core