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
The Teenager Who Explored the South Pole
The South Pole is at the bottom of the Earth. … read more
In the Know
What Is Brown v. Board of Education National Historical Park?
Long ago, school was different. Many Black children and White … read more
In the Know
Whose Picture Is on Money?
This is Anna May Wong. She was an Asian film … read more