Lithification of sand and gravel requires both compaction and ____
A)aggregation
B)filtration
C)condensation
D)cementation
E)stratification
D
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Compared to the rest of the planet, an unusually high concentration of hot spots and rifting is located on the continent of Africa. A likely explanation for this is that __________.
a) a large portion of Africa is located near the equator b) mantle plumes do not occur at divergent plate boundaries, and Africa has no divergent plate boundaries c) the African Plate is essentially stationary with respect to Earth's interior and the thick continental crust acts as a "heat blanket" d) the thick continental crust acts as a "heat blanket" and a large portion of Africa is located near the equator e) Africa is just very large
Do tropical cyclones form over land, over oceans, or both? What will be an ideal response?
Microbursts have caused airplanes to crash
Indicate whether the statement is true or false
What makes it possible for the coexistence of several warbler species that feed on the same insect larvae?
A) The birds eat in the same portion of different evergreens. B) Some of the warblers are diurnal and some nocturnal. C) The warblers do not experience intraspecies competition. D) The birds eat in the same area of different fir and spruce trees. E) The birds eat in the different portions of the forest canopy.