Earth and Its Structure

Front

Why is the stratosphere better for aircraft?

Back

Because of the clear skies and less turbulence.

Front

Is Earth the fifth largest planet in our solar system?

Back

True.

Front

What percentage of the Earth's atmosphere is made up of Nitrogen?

Back

78%.

Front

Fill in the blank: The first layer of the Earth, starting from the top, is the _______.

Back

Crust.

Front

Is the upper mantle the largest and thickest layer of Earth?

Back

True.

Front

What is the outermost layer of the Earth called?

Back

Crust.

Front

What layer of the Earth lies beneath the crust?

Back

Mantle.

Front

What is the core of the Earth primarily made of?

Back

Iron and nickel.

Front

What is the approximate thickness of the Earth's crust?

Back

5 to 70 kilometers.

Front

What is the main gas in the Earth's atmosphere?

Back

Nitrogen.