California's urban areas tend to spread out horizontally over large areas because ________
Fill in the blank(s) with correct word
they grew during the 20th century when car travel was common
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Petroleum accounts for about ________ percent of the energy used in the United States.
A. 10 B. 75 C. 25 D. 35
Which option was not an effect of gravitational push and pull on planetary embryos?
A) Embryos began to accrete particles from outside of their original feeding zones. B) The original compositional gradients from inner to outer parts of the solar system imparted by varying condensation temperatures was blurred. C) The embryo orbits crossed one another, setting up collisions that continued the planetary accretion process to the next stage ? the making of the inner rocky planets. D) The speed of rotation was increased by accretion and some of the embryos began to break apart.
In legislation, the precautionary principle applied to climate change states that ________
A) alterations to legislation must be done in a way that maximizes environmental protection at the urging of scientists without recourse from the voting public B) lack of full scientific certainty shall not be used to postpone measures to prevent major environmental degradation C) permit trading should be undertaken with caution D) caution should be used in handling hazardous wastes E) all alternative sources of energy should be evaluated by the scientific community before marketing
________ are the most widely distributed vertebrate organisms on Earth.
A. Rodents B. Humans C. Fishes D. Birds E. Insects