What is generally the range of a star's hydrogen burning lifetime?
A. from 2 billion to 15 billion years
B. from 20 billion to 100 billion years
C. from a few hundred thousand to 20 billion years
D. from a few million to 50 billion years
Answer: D
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A vertical well drills through a part of the stratigraphic section twice (repeated section). What type of fault can we infer, and why can we not explain this by folding?
What will be an ideal response?
There is more than one type of crust on Earth. What are they? How do they differ?
What will be an ideal response?
Mercury is not readily excreted but rather is stored in animal body tissues. This is an example of ________
A) biomagnification B) bioaccumulation C) toxification D) distillation
Why isn't manganese mined on the seabed when there are abundant manganese nodules in some parts of the ocean floor?
A) The manganese market is held by a global cartel who prevent the material from being mined. B) It is not economical to mine manganese nodules at present-day world prices for manganese and associated metals in nodules. C) The manganese is too difficult to extract from the nodules; a new technology is needed. D) It is impossible to extract the nodules from the seafloor with present-day technology.