What are fossils?
The remains of the dead plant and animals trapped in the layers of rocks are called fossils.
CH 2 INSIDE OUR EARTH
What are called igneous rocks?
When the molten magma cools, it becomes solid. Rocks formed in this way are called igneous rocks.
What is the earth’s crust made of?
It is made up of different types of rocks.
What are the main constituents of the core?
The main constituents of the core are nickel and iron. It is usually known as nife.
What is the radius of the core?
The radius of the core is about 3500 km.
Name the constituents of the oceanic crust?
Silica and magnesium.
Name the main mineral constituent of the continental mass.
Silica and alumina
What is the special feature of this layer?
It is the thinnest of all the layers
What is called the uppermost layer of the earth?
It is called the crust.
Limestone is changed into marble.
Limestone is changed into marble due to the following reasons: The overlying layers of rocks put pressure on the underlying rocks. From the surface to the interior of the earth, temperature and heat go on increasing. Due to pressure and heat, the original limestone changes into marble.