Which of the following processes add methane (CH4) to the atmosphere?

A. Breakdown of plant and animal remains in the soil.

B. Leakage from natural gas pipelines.

C. Food digestion by land animals.

D. All of the above.

If Jim could drive a Jetson's flying car at a constant speed of 280 km/hr across oceans and space, approximately how long (in millions of years, in 106 years) would he take to drive to a nearby star that is 8.1 light-years away? Use 9.

If gravity is always pushing down on you, what prevents you from sinking down into the ground? A. The ground is pushing you but with a greater force. B. The ground is pushing you up with a lesser force. C.

A truck travelled at a constant speed for 6 hours. Then, it decreased itd speed by 13 mph for the remaining 228 miles. If the total distance was 876 miles, how long did it take to travel the remaining 228 miles

Deductive reasoning is from the general to the specific true or false

Why is it easier to keep your position steady once the train is moving at a constant speed and direction?

As an astronaut travels towards Earth, her weight A. decreases because gravity decreases. B. decreases because her mass decreases. C. increases because gravity increases. D. remains the same because her mass remains the same.

Lightning often strikes water. a. True b. False

How much work must be done on a 10 kg snowboard to increase its speed from 4 m/s to 6 m/s?

If a spacecraft that seems to be motionless in deep space is given some type of quick push, what will happen? A. The spacecraft will not move because it only works on earth. B.

A fast, white water cascade is also known as what?