ZT-Geology: Rift


1.What is the lecture mainly about?

  • A. The recent discovery of an unusual tectonic plate
  • B. The effects of underwater riffs on plate boundaries located on land
  • C. The development of a new technology for studying rifts located on land
  • D. The process by which tectonic plates are separated

2.Why does the professor mention Iceland?

  • A. To support the claim that rifts occur wherever volcanoes occur
  • B. To point out that Iceland is located on a plate boundary
  • C. To give an example of a rift area that is located on land
  • D. To give an example of an extraordinary active rift system

3.What unexpected discovery did scientists make while studying the rift event in East Africa?

  • A. Rifts can widen more quickly than previously thought.
  • B. Some magma deposits lie closer to Earth surface than geologists realized.
  • C. Volcanic activity is not necessary for rift formation.
  • D. Volcanic activity along land rifts is different from activity along underwater rifts.

4.In the lecture the professor discusses an event that occurred along a rift in East Africa. Place the stages of this event in order.

A. Molten rock flowed into the rift and widened it.
B. There was a brief period of inactivity.
C. Seismic activity began 30 kilometers south of the northern volcanoes.
D. There was a series of earthquakes near the northern volcanoes.

5.According to the professor, what may eventually occur at the location of the recent rift event in East Africa?

  • A. Two tectonic plates will merge.
  • B. A deep basin will form.
  • C. A new fissure will open.
  • D. Underground earthquakes will become more frequent.

6.What does the professor imply when he says this:

  • A. The East Africa Rift System is much larger than previously thought.
  • B. “East Africa Rift System” is an obvious name for the system.
  • C. The East Africa Rift System is not actually a system.
  • D. Not all of the East Africa Rift System is located in Africa.