In the context of Earth's climate history, what do we mean by snowball Earth?
A) It refers to one or more deep ice ages that occurred hundreds of millions of years ago.
B) This term is used to describe all the ice ages that have occurred in the past few million years.
C) It refers to a time when polar regions had much more snowfall than normal.
D) It is what we expect to see happen on Earth in about a billion years.
A) It refers to one or more deep ice ages that occurred hundreds of millions of years ago.
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A 40.0-kg crate is being raised by means of a rope. Its upward acceleration is 2.00 m/s2. What is the force exerted by the rope on the crate?
A) 80.0 N B) 312 N C) 392 N D) 472 N E) 552 N
Which of the following is a general characteristic of the four jovian planets in our solar system?
A) They are significantly lower in average density than are the terrestrial planets. B) They have very high levels of volcanic and tectonic activity. C) They are made predominantly of elements heavier than hydrogen and helium. D) They rotate more slowly than the terrestrial planets.
The recent modification of the standard Big Bang model is called the ______________ model
Fill in the blank(s) with correct word
At higher altitudes water boils at ________ temperature as/than at sea level
A) a lower B) a higher C) the same