If the acceleration of an object is negative, the object must be slowing down
A) True
B) False
B
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Based on current evidence, when is/was liquid water abundant on the surface of Mars?
A) only before about 3 billion years ago B) only during the first 1 million years of Mars's existence C) Water comes and goes, with the most recent water flows occurring a few thousand years ago. D) only during the most recent 1 billion years of Mars's history
The Permian extinction event was mostly likely caused by
A) widespread volcanic activity in Siberia B) an asteroid impact C) the onset of a snowball Earth phase D) the reversal of the Earth's magnetic field
Compare the differential rotation rates of the four jovian planets
What will be an ideal response?
The ionosphere is an electrified ion-rich area
A) in the uppermost troposphere. B) where atoms lose their electrons and are negatively charged. C) where air density and solar radiation is low. D) within the uppermost mesosphere and thermosphere.