Although spectacular collisions like comet Shoemaker-Levy 9 impact with Jupiter in 1994 provide evidence that planetary accretion is still occurring, near all the mass of the solar nebula now resides in the sun and planets
When did Earth, for the most part, attain its current mass and volume?
A) 65 million years ago
B) 12,000 years ago
C) it hasn't
D) 4,500 million years ago
Answer: D
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The intrinsic motion of stars is best described as their
A. apparent yearly cycle around the Sun, due to Earth's revolution. B. motion relative to all other bodies. C. circular motion across the sky in a 24-hour period. D. motion relative to Earth.
Define the term invasive species and give two examples from your textbook
What will be an ideal response?
Which of these West African countries has the highest fertility rate in the world and half the population under the age of fifteen?
a. Burkina Faso b. Sierra Leone c. Ghana d. Nigeria e. Niger
What is the range of the angle of repose for most dry, unconsolidated materials (such as dry sand)?
a. 0o ~10o b. 15o~20o c. 30 o ~ 37 o d. 50 o ~ 60 o