What can we learn from the detailed shapes of craters?
What will be an ideal response?
The shapes of craters can tell us the type of terrain in which they formed and whether they have been subject to erosion. Craters that form in rocky surfaces usually have a simple bowl shape. Craters that form in icy ground may look as if they formed in mud. Craters that lack sharp rims and bowl-shaped floors have probably been reshaped over time by erosion.
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The "wispy terrain" on Rhea was revealed by the Cassini spacecraft to be
A) ice cliffs created by tectonic fractures. B) water ice flows from past impacts that cracked its icy surface. C) the icy ash of water volcanoes. D) "maria" created during the period of high impacts. E) water ice flows from geyser-like activity.
Which type of heavy atomic nuclei are most common, and why?
A) Transuranium elements, for only very heavy elements are made in supernovae. B) Odd numbered elements, because hydrogen is the building block for all heavier elements. C) Even numbered elements, for helium is "giant food" for everything beyond itself. D) Metals, for iron is the last abundant element formed before the type II supernova. E) Noble gases, for they are the most stable elements.
What is the energy in eV of a photon of yellow light? ? = 500 nm
Lens-Maker Formula: The figure (which is exaggerated somewhat for clarity) illustrates a thin lens. This lens is made of a material with an index of refraction of 1.48, and has radii of magnitudes 6.0 cm and 4.0 cm. What is the focal length of the lens?
A. +25 m B. -5.0 cm C. -4.0 m D. +5.0 m E. -25 cm