How long do CFC molecules remain active in the stratosphere?

a. 10 to 50 years

b. 30 to 60 years

c. 60 to 120 years

d. 150 to 500 years

A student slides down a slide at recess. After getting off the slide he goes to cross the monkey bars. As he touches the metal of the monkey bars, he gets a shock. How did the electric charge transfer from the slide to his body?

8. Why are objects that fall near Earth's surface rarely in free fall? Gravity does not act on objects near Earth's surface. Air exerts forces on falling objects near Earth's surface. The objects do not reach terminal velocity.

Which conditions are usually the effect of a low air pressure system? clear, dry weather cloudy, wet weather cold, dry weather hot, dry weather

What two controls on a car causes a change in speed

A distinct layer within a soil profile is called a/an

Water is a compound. O A. True B. False

How do air quality scientists ensure the air is cleaned? What steps do they take?

Is a mirrors surface opaque or transparent or translucent?

Sound waves can combine to become bigger or smaller true or false

Archimedes supposedly was asked to determine whether a crown made for the king consisted of pure gold (density of gold is 19.3 * 103 kg/m3). According to legend, he solved this problem by weighing the crown first in air and then in water.