Characteristics to Support Life on Earth

Front

What is the atmosphere?

Back

The entire mass of air that surrounds Earth, made up of 78% nitrogen, 21% oxygen, and trace amounts of other gases.

Front

What is the ozone layer?

Back

A gas in Earth’s atmosphere that absorbs most of the damaging high-energy ultraviolet radiation from the Sun.

Front

Why are greenhouse gases important for sustaining life on Earth?

Back

They help keep Earth warm.

Front

What is necessary for life as we know it to exist on a planet?

Back

Liquid water.

Front

What percentage of Earth's atmosphere is nitrogen?

Back

78%.

Front

What percentage of Earth's atmosphere is oxygen?

Back

21%.

Front

What role does the Sun play in supporting life on Earth?

Back

It provides solar energy necessary for photosynthesis and warmth.

Front

What is the primary function of the atmosphere?

Back

To protect living organisms from harmful solar radiation and to regulate temperature.

Front

What are the main components of Earth's atmosphere?

Back

Nitrogen, oxygen, carbon dioxide, and trace gases.

Front

How do greenhouse gases affect Earth's temperature?

Back

They trap heat in the atmosphere, preventing it from escaping into space.