Early Earth was hot because ________
A) gravitational collapse generates heat
B) a combination of collisions and radioactive decay produced heat
C) there was still heat from the original big bang
D) the moon's formation from an giant impact produced heat
E) the Sun was much larger and heated the early planet
B
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One advantage of materials recovery facilities (MRFs) is that ____.
A. combustible wastes can be burned to generate electricity B. they are inexpensive to build C. they reduce the production of municipal solid waste D. electricity generation offsets emissions of toxic ash E. they eliminate the need for source separation
Membranes are considered selectively permeable when they allow only certain kinds of small molecules to pass through
a. True b. False
Between 1972 and 1992, GDP increased by approximately 2 trillion dollars. In comparison, GPI:
- Decreased by 1 trillion dollars. - Increased only slightly. - Stayed exactly the same. - Also increased by 2 trillion dollars.
What are some examples of nonfoliated metamorphic rocks? What will be an ideal response?