Which of the following statements is correct?
a.
water is used to moderate (slow down) neutrons in a nuclear reactor.
b.
carbon control rods are used to absorb neutrons in a nuclear fission reaction.
c.
a very high temperature is required to initiate a nuclear fission reaction.
d.
the energy released from the sun is the result of a nuclear fission reaction.

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. label the following topographic map. click on a label below the map to select it, and then click on the appropriate box on the map to place the label. (increments for contour lines is 50 ft).

What does natural resource management aim at ?

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels