A secondary rainbow is dimmer than the primary rainbow because
A. it is larger, and its energy spreads across more area.
B. it simply has much less energy than the primary bow.
C. of a double reflection and refraction in the drops.
D. its colors are inverted.
Answer: C
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Why are native trees more diverse in North America than in Europe?
A) The larger ice sheets in North America caused more species to go extinct. B) North American trees expanded into mountain ranges during glaciations. C) European trees were trapped between the ice sheet and E-W trending mountain ranges. D) North American trees are all of tropical origin.
Streams are important natural resources. How do humans use the water withdrawn from streams?
What will be an ideal response?
A population is ________
A) a group of individuals of several interacting species that live in one area B) the sum of all individuals of a species in all locations C) a group of individuals of a single species that live and interact in one area D) a group of individuals of several interacting species that interact in multiple ecosystems E) a group of cells that have similar function
The equilibrium of a slope is likely to be disturbed if the ____
a. ?slope angle steepens or the load is either increased or decreased b. ?slope angle is steepened or shallowed and the load is decreased c. ?angle of repose is decreased d. ?slope angle steepens or the load is increased e. ?cohesion of grains is increased