Earth as a planet.

What are the two main gases the earth's atmosphere is made up of ?

• Oxygen and Nitrogen

• Oxygen and Carbon-dioxide

• Nitrogen and Carbon-dioxide

• Hydrogen and Helium

Greenhouse effect is a

• Endogenic process

• Natural process

• Man-made process

• Chemical process

The inner most layer of the earth is

• Crust

• Mantel

• Core

• Lithosphere

Mantel is ________% of the earth's mass

• 21

• 1

• 84

• 15

The core is composed of-

• Oxygen and nitrogen

• Iron and Nickel

• Silica and Magnesium

• Silica and Aluminium

The crust extends for about ______miles

• 50

• 11

• 100

• 25

Earth's axis is inclined by ______

• 23.7 degrees

• 23.0 degrees

• 23.5 degrees

• 23.5 degree

What is the temperature at surface of oceanic crust?

• -5 degrees

• 0 degrees

• 5 degrees

• It depends

SIMA Floats above SIAL. True or False

• True

• False

________ is 2900 km thick

• Crust

• Mantle

• Inner Core

• Outer Core