What is responsible for causing weather on Earth?
A) the presence of the oceans
B) the unequal heating of Earth's surface
C) carbon dioxide in the atmosphere
D) the jet streams.
Answer: B
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Matter falling into a black hole forms a(n) _______________ disk
Fill in the blank(s) with correct word
According to this graph, the minimum size of an object that could cause a mass extinction is a little less than _____.
A. 10 m B. 100 m C. 1 km D. 10 km E. 100 km
A 35-mm digital camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens
You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens. (a) In refocusing, by how much did you move the lens? Did you move it toward the film or away from it? (b) What is the height of the flower's image on the CCD sensor?
A 10-kg rock and 20-kg rock are dropped from the same height and there is no air. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground?
A) 4T B) 2T C) T D) T/2 E) T/4