Lesson 1.1: The Atmosphere Around You

Front

As altitude _________, air pressure_________.

Back

increases, decreases

Front

Air pressure is affected by....

Back

Altitude

Front

What is the atmosphere?

Back

A layer of gas surrounding a planet or moon.

Front

What gas makes up around 21% of our atmosphere?

Back

Oxygen

Front

Is it easier to breathe at higher altitudes, or lower altitudes?

Back

Lower, because the air density and pressure is higher.

Front

What is air pressure?

Back

The force exerted by the weight of air above a surface.

Front

How does temperature affect air pressure?

Back

As temperature increases, air pressure decreases.

Front

What is the composition of the Earth's atmosphere?

Back

Mainly nitrogen (78%) and oxygen (21%).

Front

What happens to air pressure as you climb a mountain?

Back

Air pressure decreases.

Front

Why do we need the atmosphere?

Back

It provides oxygen for breathing and protects us from harmful solar radiation.