Question

1. what type of plate boundary is illustrated in figure 9 - 1? a. transform fault boundary b. divergent boundary c. convergent oceanic - oceanic boundary d. convergent oceanic - continental boundary
2. what feature is labeled b in figure 9 - 1? a. trench b. ocean ridge c. volcanic island arc d. continental volcanic arc
3. what layer of earth is labeled c in figure 9 - 1? a. asthenosphere b. continental lithosphere c. oceanic crust d. continental crust
4. what process is illustrated by the area labeled g in figure 9 - 1? a. seafloor spreading b. continental volcanism c. rifting d. subduction
5. what were the dominant animals of the mesozoic era? a. fish b. reptiles c. mammals d. bacteria
6. name the 4 - time frames in order from oldest to youngest a. precambrian, paleozoic, mesozoic, cenozoic b. mesozoic, precambrian, cenozoic, paleozoic c. paleozoic, mesozoic, precambrian, cenozoic d. cenozoic, mesozoic, paleozoic, precambrian
7. which era is classified as the \age of mammals\? a. cenozoic b. precambrian c. paleozoic d. mesozoic
8. what is the most recent era of time? a. mesozoic b. paleozoic c. cenozoic d. precambrian
9. the time span that lasted the longest was the a. paleozoic b. precambrian c. mesozoic d. cenozoic

Explanation:

1. In the figure, one plate is being forced under another, which is characteristic of a convergent oceanic - continental boundary.
2. The feature labeled B is a deep - elongated depression in the ocean floor, which is a trench.
3. The layer labeled C is the thin, dense layer beneath the ocean, which is the oceanic crust.
4. The area labeled G shows one plate moving beneath another, which is the process of subduction.
5. Reptiles were the dominant animals during the Mesozoic Era.
6. The correct order of time frames from oldest to youngest is Precambrian, Paleozoic, Mesozoic, Cenozoic.
7. The Cenozoic era is known as the "age of mammals".
8. The most recent era of time is the Cenozoic era.
9. The Precambrian time span lasted the longest.

Answer:

1. d. convergent oceanic - continental boundary
2. a. trench
3. c. oceanic crust
4. d. subduction
5. b. Reptiles
6. a. Precambrian, Paleozoic, Mesozoic, Cenozoic
7. a. Cenozoic
8. c. Cenozoic
9. b. Precambrian