Why is a stream able to pick up a grain of sand, but not a smaller grain of silt?
A) Gravity forces the silt to remain on the ground.
B) Certain patterns of water flow work better for larger particles.
C) Adhesion keeps the silt particles attached to the rock below.
D) Cohesion keeps the silt particles attached to each other.
Answer: D
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At the peak of the Pleistocene glaciation, sea level was ________
A) 130 centimeters (51 inches) lower than today's sea level B) 130 centimeters (51 inches) higher than today's sea level C) the same as today's sea level D) 130 meters (427 feet) lower than today's sea level E) 130 meters (427 feet) higher than today's sea level
La Niña usually causes a drought in Southeast Asia
Indicate whether the statement is true or false.
What is the population of the world likely to be by the year 2050?
a. 5 billion b. 7 billion c. 9 billion d. 11 billion e. 13 billion
Removal of which of the following species will always result in the greatest changes in an ecological system?
A) a decomposer species B) a producer species C) a carnivore species D) a competitive species E) a keystone species