The Roche limit is the
a. distance from the sun within which a planet can not retain an atmosphere.
b. minimum mass of an object in the solar system that would be classified as a planet.
c. maximum separation distance between the sun and a given planet.
d. distance from Earth at which we loose radio communication with a satellite.
e. distance from a planet within which a planet can not hold itself together.
E
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The figure shows the ______ and _____ Moon phases
a.
crescent; first-quarter
b.
new; new
c.
crescent; full
d.
first-quarter; full
Why are fossils of early life on Earth more rare than fossils of plants and animals from the past few hundred million years?
A) Early organisms lacked skeletons and other hard structures that are most likely to be fossilized. B) Life was far less abundant before a few hundred million years ago. C) Fossils could not form before there was oxygen in the atmosphere. D) We find fossils in sedimentary layers, and no sediments were deposited until just a few hundred million years ago.
Lipids are more commonly known as
A) enzymes B) sugars C) fats D) organic acids
Which of these is not accelerating?
A) a car starting up from rest B) a car while it is moving at unchanging speed up a straight [or steady] incline C) a car going over the crest of a rounded hill at a constant speed D) a car while it is rounding a corner at constant [or steady] speed E) actually all of these cars are accelerating