What causes the gas and dust cloud to condense and become a star?
Which star is most likely to become a supernova?
Which process produces large amounts of energy in a star by combining lighter elements into a heavier element?
Which radioactive isotope takes the greatest amount of time to disintegrate?
Which graph below represents the amount of potassium-40 and the amount of argon-40 and calcium-40 over four half-lives?
Which type of front is represented by this cross section?
Clouds are forming along the front because the rising air is
Which statement best describes the difference in air temperature and humidity between the cP and mT air masses?
Which motion causes observers on Earth to see different constellations at different times of the year?
At position 5, an observer on Earth sees a full Moon (the fully lighted side of the Moon) at midnight. At this time, the full Moon would appear closest to the constellation
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