[Chapter 20. Introducing Astronomy: Looking Beyond the Earth] The primary difference between a total solar eclipse and a partial solar eclipse is that a total solar eclipse is seen from a position on the Earth in the Moon’s __________ and a partial solar eclipse is seen from a position on the Earth in the Moon’s __________.

[Chapter 8 and 9: Geological Time and Geological History] If 75% of 238U has decayed to 206Pb, how many half-lives have passed?

[Chapter 2. The Way the Earth Works Plate Tectonics] According to the image below, where is new oceanic crust being formed?

[Chapter 14. Ocean Waters: The Blue of the Blue Planet] Kelp (large brown algae) grows along the western coast of North America because of the __________ nutrient-rich waters provided by __________.

[Chapter 14. Ocean Waters: The Blue of the Blue Planet] What ship is shown below, and what is its significance?

[Chapter 8 and 9: Geological Time and Geological History] In the very distant future, plastic materials may be found in geologic strata currently being laid down. These will be considered ______.

[Chapter 7. A Violent Pulse: Earthquakes] An earthquake with a magnitude 6 has __________ times the ground motion of an earthquake with a magnitude 5.

[Chapter 18. Danger in the Air: Stormy Weather] On the map below, the jet stream created a low-pressure system with a __________ front to the south and a __________ front to the northeast. This can result in the formation of a __________.

[Chapter 1 From the Big Bang to the Blue Marble] The Earth’s layers can also be distinguished by the behavior of material. These layers are the _______ and _______.

[Chapter 8 and 9: Geological Time and Geological History] The difference between relative and numerical ages is that relative age is _______.