Earth Science 101 Exam 1 Review With
Complete Solutions
1. The study of Earth's atmosphere is known as Answer: meteorology
2. The refers to the sum total of all life on Earth Answer: biosphere
3. The explains how our solar system probably formed from a giant cloud of gases and dispersed solid
artlcles Answer: nebular theory
4. A(n) system is one in which energy moves freely in and out, but no matter enters or leaves the
system. Answer: a. closed
5. the asthenosphere is actually a part of the of the Earth. Answer: d. mantle
6. What is the source of the energy that powers the Earth system? Answer: the Sun
heat from Earth's interior
13. In the Ptolemaic (Greek) model of the universe, the Answer: b. Earth was in the center of the
universe
14. Galileo observed several features using the telescope. Which one of the following did he not
discover? Answer: d. the two moons of Mars
15. A very slow motion of Earth's axis that requires 26,000 years to complete is called Answer: c.
axial precession.
, 16. The day is the time it takes for Earth to make one complete rotation with respect to a star other than
our Sun. Answer: b. sidereal
17. Three laws of planetary motion were discovered by Answer: a. Johannes Kepler.
. Earth hits its perihelion position in January. Solar radiation is proportional to the distance squared
between the sun and the earth, so why isn't it hot in "winter" at perihelion? Answer: c. c. The
ellipticity of the orbit is small, so the affect is small; seasons are caused by tilt of the earth's orbit.
25. Which of these lunar features is the oldest? Answer: b. lunar highlands
26. Which of the following is NOT a jovian planet? Answer: a. Pluto
27. Which one of the following is not found on Mars? Answer: b. H2O-rich atmosphere
28. The most popular theory for the origin of the moon today is Answer: d. the early earth and a
planet the size of mars collided, and the ejected material coalesced to form the earth's moon.
29. refers to the bright head of a comet. Answer: c. Coma
30. Most of the mass in the solar system is contained Answer: a. in the sun.
31. Neptune and Uranus both appear bluish in sunlight whereas Jupiter and Saturn are multicolored.
Why are Nepture and Urarius blue'? Answer: b. They contain methane ice in their atmosphere
which causes the color
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