In order to predict whether a star will eventually fuse oxygen into a heavier element, you mainly want to know what fact about the star?
A) how much oxygen it now has in its core
B) its mass
C) its luminosity
D) its overall abundance of elements heavier than helium
B
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The cheapest and probably most effective means of interstellar communication is ________
Fill in the blank(s) with correct word
A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually doesn't break. This is because for the egg dropped on the grass:
a. the change in momentum is greater. b. the change in momentum is less. c. the time interval for stopping is greater. d. the time interval for stopping is less.
Quito, Ecuador, is at an altitude of 2,850 meters above sea level, while New York City is at sea level. If you are preparing a hard-boiled egg in Quito, it would have to be placed in boiling water
A) for the same amount of time as in New York. B) for a shorter time than in New York. C) for a longer time than in New York. D) There is not enough information to answer this question.
The last major dinosaurs were wiped out as a consequence of a major impact with the Earth about 65 million years ago. All but one of the following statements would be regarded as evidence for this claim
A) The fossil record shows a mass extinction event 65 million years ago, where only 25% of the species survived. B) At least 150 craters from past impacts have been identified, including one of the right age and size in Mexico. C) A layer of iridium in 65-million year old sediments in the Earth's crust D) Multiple historical accounts describe a planetary-level flood and storm that wiped out most living things.