Which of these upcoming observations will help test the idea that Mars' atmosphere thinned due to interactions with the solar wind?
A) Astronomers will use spectrographs on the Keck telescope to measure the density of Mars' atmosphere.
B) The upcoming MAVEN orbiter will measure present-day gas loss from Mars' atmosphere.
C) Geologists will measure the carbon content of Martian rocks that were transported to Earth by asteroid impacts.
D) The Curiosity rover will measure the carbon content of rocks on Mars' surface.
B
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Which of the following characteristics describes silicate minerals?
-Silicate minerals contain only silicon. -Silicate minerals make up 8 percent of Earth's crust. -Silicate minerals contain calcite and dolomite. -Silicate minerals contain halite and gypsum. -Silicate minerals contain silicon and oxygen.
Diffraction is the tendency of light to:
A) spread around corners. B) separate into its component colors. C) bend through a lens. D) disperse within a prism. E) reflect off a mirror.
During the period of one day, the number of high tides at a given location is about __________
Fill in the blank(s) with correct word
An iceboat is traveling in a circle on the ice. Halfway around the circle the sail and the steering mechanism fall off the boat. Which statement is correct?
a. The boat will continue traveling in the circle because there is no friction. b. The boat will continue to travel in the circle because its velocity exerts a force on it. c. The boat will move off on a line tangent to the circle because there is no force on it. d. The boat will move off tangent to the circle because there is a force on it perpendicular to the boat directed to the outside of the circle. e. The boat will move off to the outside perpendicular to the tangent line since a force directed to the outside of the circle always acts on the boat.