Answer: C
Explanation: Earth's atmosphere isn't very dense because it is made of air, which floats. Human beings are denser then air since they are solid, but not as dense as Earth's crust, which is rocky and the densest out of the three.
An example of force that acts at distance is gravity and an example of contact force is pushing a chair across the room
Oxygen, carbon dioxide and your mom
Which disease symptoms u would like to know?
