The oldest hominids belong to the genus Homo. Indicate whether the statement is true or false
F
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Natural gas reserves in the United States ________
A) are larger than those of any other country B) have been almost fully depleted, so the United States must import most of its natural gas C) are expected to last at least another 70 years D) are being replenished more quickly than they are being used
Which is not a reason why a refined oil spill is more harmful?
a. The oil contains more energy potential due to additives during the refinement process. b. There are more biologically active components remaining in refined oil. c. The refining process removes heavier components. d. There are components that are added to oil which are deadly.
Sea-floor spreading implies that sea-floor rocks should be ________.
A. youngest on the crest of mid-ocean ridges B. youngest on the continental shelf C. younger as water become colder D. younger toward the trench E. the same age throughout
The highest soil degradation rates occur in Africa. Indicate whether the statement is true or false