The tilt of Earth's axis to the plane of its orbit around the Sun
A) stays the same.
B) varies about 2.5 degrees.
C) is currently about 3 degrees.
D) goes through one cycle of change about every 1.1 million years.
E) has a major effect on Earth's eccentricity.
B
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Earth experiences ice ages partly because there are variations in Earth's
A) greenhouse gas levels. B) sea level. C) seismic activity. D) tilt and orbit.
If a neutral element has the following chemical notation, how many electrons does it have? fluorine-19
A) 9 B) 10 C) 11 D) 19 E) none of the above
What were the various theories about the age of the Earth? How did these theories lead to advances in
science and new discoveries? What will be an ideal response?
Complex I of the electron and H+ transport chain contains a number of clusters made up of a metal and a nonmetal. Which atoms are found in these clusters?
A) iron and nitrogen B) iron and sulfur C) magnesium and nitrogen D) magnesium and sulfur