How does seafloor crust differ from continental crust?
A) Seafloor crust is thinner, older, and lower in density.
B) Seafloor crust is thinner, younger, and higher in density.
C) Seafloor crust is thicker, older, and higher in density.
D) Seafloor crust is thicker, younger, and lower in density.
B
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Two spacecraft in outer space attract each other with a force of 20 N. What would the attractive force be if they were one-half as far apart?
A. 5 N B. 10 N C. 40 N D. 80 N
Which of these was NOT seen telescopically by Galileo?
A) sunspots B) Venus' phase cycle C) stellar parallax D) four moons around Jupiter E) craters and mare on the Moon
A ball thrown upward reaches its maximum height and then falls back. If air resistance is negligible, its acceleration is
A. the same at all points in the motion. B. less on the way up than on the way down. C. the same up and down but zero at the top. D. less on the way down than on the way up.
Consider an asteroid that orbits the Sun once every 5 years. Does this object ever cross the Earth's orbital path?
1.Yes, it must cross twice every five earth years. 2.No, it can never cross Earth’s orbital path. 3.Yes, it must cross once every Earth year. 4.It is impossible to tell.