Much of the solar wind comes from ____ where the magnetic field does not loop back into the sun
a. prominences
b. coronal holes
c. spicules
d. granulation
e. auroras
B
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Where on Earth is the impact crater that scientists believe caused the extinction of dinosaurs?
a. Flagstaff, Arizona b. Chicxulub, Mexico c. Aricebo, Puerto Rico d. Mauna Kea, Hawaii e. Antarctica
A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the Earth, what is the speed of the rain with respect to the Earth?
A. 48 km/h B. 95 km/h C. 58 km/h D. 32 km/h E. 80 km/h
According to fossil evidence, how far back in time did life on Earth exist?
A) about 545 million years B) about 2.0 billion years C) about 65 million years D) about 3.5 billion years or more
What does this figure tell us?
A) The current level of carbon dioxide in our atmosphere is higher than it has been at any time during the past 800,000 years. B) Earth is now warmer than it has been at any time during the past 800,000 years. C) The current level of carbon dioxide in our atmosphere can be attributed to natural changes in Earth's climate. D) The level of carbon dioxide in our atmosphere changes randomly with time, so there is no way to predict how it will change during the next century. E) The current level of carbon dioxide in the atmosphere and the global average temperature are both higher today than at any other time during the past 800,000 years.