At high altitudes, there is less oxygen. Oxygen is a gas in the air. Our bodies need oxygen to survive. When we do not have enough oxygen, we get sick.
Photo Credit: Adam Sternin/Cavan Images/Image Source
In the Know
What Is a Laser?
Some lasers can cut through steel. Companies that make parts … read more
In the Know
Mask Up!
A mask blocks the drops. It stops the virus from … read more
In the Know
Patterns All Around
Patterns can be seen in many different places. Look at … read more