The amount of carbon dioxide in Earth's atmosphere has been increasing over the last 50 years because of
a. global warming.
b. the growth of the ozone hole.
c. the burning of fossil fuels.
d. increased energy output from the Sun.
e. increased magnetic activity in the Sun.
c. the burning of fossil fuels.
You might also like to view...
Lightning bolts occur between
a. Clouds and the ground. b. clouds. c. Both A and B.
When did humans first learn that Earth is not the center of the universe?
A) about 2000 years ago B) around the time that early humans acquired language C) within the past 500 years D) We haven't; there is still considerable scientific debate about whether Earth is the center of the universe.
A 2000 kg car accelerates up to a velocity of 40 m/s in 5.0 seconds. The brakes are applied, and the car is brought to a stop. The work done by the friction in the brakes is
A. 
B. 
C. 
D. 
E. 
There is an upper limit on the speed of a particle, which means there is also an upper limit on its
A) momentum. B) kinetic energy. C) both of these D) neither of these