Seasons on Earth are primarily caused by:
A) the distance from the Earth to the Sun.
B) the tilt of the Earth's rotational axis.
C) the tilt of the Earth's magnetic axis.
D) the precession of the Earth's rotational axis.
E) the dates of the solstices and equinoxes.
B
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An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains
A) 4 electrons. B) 6 electrons. C) 10 electrons. D) at least 1 electron.
Convert a speed of 4.50 km/h to units of ft/min. (1.00 m = 3.28 ft)
A) 0.246 ft/min B) 82.3 ft/min C) 246 ft/min D) 886 ft/min E) 165 ft/min
The mat of a trampoline is held by 32 springs, each having a spring constant of 5 000 N/m. A person with a mass of 40.0 kg jumps from a platform 1.93 m high onto the trampoline. Determine the stretch of each of the springs
The region around 2b has far fewer craters than the region around 2c) The crater floor at 2a is also flat and smooth, without many smaller craters on it. Why are regions 2a and 2b so smooth?
A) Few small craters ever formed in these regions. B) Erosion erased craters that once existed in these regions. C) Lava flows covered craters that once existed in these regions.