Scientists once thought that Earth's primary atmosphere was composed of _____
A) hydrogen and methane
B) nitrogen and oxygen
C) carbon dioxide and methane
D) oxygen and hydrogen
A
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Life in the subsurface ocean of Europa will most likely consist of
A) creatures similar to seals and penguins which enter the ocean through holes in the icy crust B) plants on the ocean floor C) simple single-celled organisms D) fish and other complex aquatic organisms
How did oxygen (O2) get into Earth's atmosphere?
A) It was released by life through the process of photosynthesis. B) It was captured from the solar nebula. C) It was outgassed from volcanoes. D) It came from chemical reactions with surface rocks.
Which of the following asteroids is now officially a dwarf planet?
A. Itokawa B. Ceres C. Eros D. Mathilde E. Ida
When a car of mass accelerates from 10.0 m/s to some final speed, 4.00 × 105 J of work are done on it by the frictional force exerted on the car by the road's surface. Find this final speed
A) 28.0 m/s B) 22.4 m/s C) 25.2 m/s D) 30.8 m/s