L N 3

Which is the hardest substance?

• Salt

• Diamond

• Silver

The uppermost layer of the earth's interior is called

• Mantle

• Core

• Crust

The molten rock material present inside the earth

• Magma

• Lava

• None of these

The full form of SIMA is.

• Silica and mica

• Silica and magma

• Silica and magnesium

Earth quakes and volcanoes are caused by.

• Over population

• External disturbance

• Internal disturbance

Rocks are classified into _____ groups.

• 3

• 4

• 2

Living organisms do not survive inside the earth due to.

• Excessive water

• Presence of gases

• High temperature

Earth was formed about ____ milian years ago.

• 4500

• 4600

• 4700

What is the depth of the upper Mantle

• Upto 300 km

• Upto 200 km

• Upto 100 km.

Shaking and trembling of the earth's surface

• Rocks

• Magma

• Earthquake