In the innermost portion of the Sun, the core, extremely high temperatures and high densities lead to the energy-creating process of
A) nuclear fission.
B) nuclear fusion.
C) the big bang.
D) nuclear differentiation.
Answer: B
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Gastornis was a large flightless bird that preyed on mammals and became extinct 2 million years
ago. Indicate whether the statement is true or false.
During a total lunar eclipse, the moon remains visible because ________
A) the atmosphere of the earth refracts light around its perimeter B) the atmosphere of the moon diffuses light from the other side of the moon C) the earth is too far from the moon to totally cover the solar disk D) None of the above; the moon completely disappears against the night sky.
What are rare-earth elements, and where are they found in the ocean?
a) An assortment of 17 elements like neodymium used in technology, found in sea floor muds b) Gypsum and halite used for making casts, molds and sheetrock (gypsum), and as table salt (halite), found in warm shallow water c) Gas hydrates used for fuels, found on continental shelves d) Manganese nodules used in modern technology, found near hydrothermal vents
The presence of an S-wave shadow zone implies that the Earth's core is liquid.
Answer the following statement true (T) or false (F)