Two isotopes have the same __________ number
Fill in the blank(s) with correct word
atomic
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Do either Venus or Mars have composite volcanoes? Why or why not?
a. Venus has some composite volcanoes because of large currents of magma beneath the crust. Mars has only shield volcanoes because tectonics on Mars does not occur. b. Mars has some composite volcanoes because of its great shield volcano explosions. Venus has only shield volcanoes because of its low-density crust. c. Yes, volcanoes on Venus and Mars are higher, wider and have the composite structure because of repeated eruptions at the same place. d. Mars and Venus only have shield volcanoes. Geological processes are vertical on these planets, and plate tectonics and significant horizontal crust motion do not occur.
The decoupling of the strong force from the electroweak force provided energy for a rapid inflation of the Universe
a. True b. False Indicate whether the statement is true or false
A very light cart holding a 300-N box is moved at constant velocity across a 15-m level surface. What is the total work done in the process?
a. 4500 J c. 20 J b. 1/20 J d. zero
Why do comet's tails always point away from the Sun?
A) because of solar wind B) because the inner planets cause the ice and other volatile materials to be pulled towards their orbits C) because of the comet's interaction with dark matter D) because when they move away from the Sun they begin to lose inertia