The spinning of a shrinking nebula marks the transition from a protostar to a star. Indicate whether the statement is true or false
ANS: F
A spinning nebula begins to shrink over time. As the gases of the sphere flatten and condense at the
center, it becomes a protostar. Hydrogen atoms eventually begin to fuse into helium which releases a
great amount of energy. The rapid release of energy marks the transition to a star. Information can be
found in the section Stars and Seas
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If the mass of a cart is quickly loaded so that its mass doubles while being propelled by a constant force, the cart's acceleration
A. halves. B. doubles. C. stays the same. D. quadruples.
What key characteristic marks the beginning stages of the collapse of a star?
A) The increase in temperature B) The depletion of carbon and oxygen C) The depletion of hydrogen D) The expulsion of energy
A cowboy says he is going to ride his horse across the "Great Divide." What landform is he talking about?
A. a watershed B. a volcano C. a mountain range D. a stream
A glacial landform that forms at the head of glacial valleys or troughs is called a(n):
a. horn. b. esker. c. kame. d. arête. e. cirque