What chemical is responsible for depleting the Earth's ozone at a rapid rate?
A) DDT
B) PCBs
C) CFCs
D) Carbon dioxide
C
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The changing distance between the earth and the sun over the course of the year is the main cause
of the seasons. Indicate whether the statement is true or false.
What is the definition of magma mixing?
A) When magma mixes with fluids to become more dilute B) When rising magma melts surrounding country rock and incorporates it C) When one rising magma will overtake a second and the two intermix D) When magma incorporates more dissolved gases
Which of the following ions can pass through the open channel of the acetylcholine receptor?
A) K+ B) Na+ C) both a and b D) neither a nor b
Globally, where would you be most likely to find type D and type E climates?
A. D near 60 degrees latitude, E near poles B. D and E near 60 degrees latitude C. D and E near poles D. D near poles, E near 60 degrees latitude