Seasonal changes in the darker surface features of Mars are due to ________
Fill in the blank(s) with correct word
dust storms and winds
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________ form when galaxies collide and ________.
A. Quasars; emit large amounts of heat and radio waves B. Starburst galaxies; star formation is triggered, making them very bright C. S0 galaxies; all their stars are destroyed D. Starburst galaxies; all their stars are destroyed
It was the newly developed ________ theory which allowed Adams and Leverrier to predict the position of Neptune from the motions of Uranus
Fill in the blank(s) with correct word
Which internal heat source still generates heat within the terrestrial worlds today?
A) heat of accretion B) heat from differentiation C) heat from convection D) heat from radioactive decay
Each group in a tug-of-war pulls with 1000 N on each side of the rope. The net force on the rope is
1) 0 N 2) 500 N 3) 1000 N 4) 2000 N and the tension within the rope is 5) 0 N. 6) 500 N. 7) 1000 N. 8) 2000 N.