The Jovian planets have lower average densities than the terrestrial planets
a. True
b. False
Indicate whether the statement is true or false
True
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What is the dynamo model of Earth's magnetic field?
A. Earth's magnetic field changes too rapidly for it to be generated in Earth's interior. B. Earth's magnetic field is maintained by convection in the interior of the planet, as well as its rotation. C. Electric currents in the atmosphere (aurora) generate Earth's magnetic field. D. Currents in Earth's oceans maintain the planet's magnetic field. E. None of these choices are correct.
Two cars crash head on. At any given time during the crash, the magnitudes of the collision forces exerted on each car are exactly equal. This is an example of Newton's
a. first law. b. second law. c. third law. d. no law.
A common use of a diffraction grating is to
A. focus light onto the retina. B. split light into different polarizations. C. reflect light into a different direction. D. separate light into its separate wavelengths.
On a weather map, closely spaced circular isobars around a central low pressure area with winds moving counterclockwise about the center may represent
A) approaching fair weather. B) a hurricane. C) an approaching snow storm.