1.What is the main purpose of the lecture?
A. To discuss environment phenomena that have changed the phosphorus cycle
B. To illustrate how interrupting the phosphorus cycle can affect the environment
C. To describe how phosphorus ends up in the atmosphere
D. To explain how phosphorus gets recycled in the environment
2.Which human activities that influence the phosphorus cycle does the professor mention? [Click on 2 answers.]
B. Building dams on rivers
C. Polluting the oceans
D. Marking and using fertilizer
3.Why does the professor discuss underwater volcanoes?
A. To describe the location of most of the phosphorus on Earth
B. To point out the difficulty of studying the phosphorus cycle
C. To describe a step in the phosphorus cycle
D. To illustrate the differences between two phases in the phosphorus cycle
4.What can be inferred about the professor ‘s view on phosphorus getting washed into rivers?
A. She is unconcerned because phosphorus is a beneficial nutrient.
B. She is concerned about the quantity of phosphorus entering the waterways.
C. She thinks that the amount of research conducted on the topic is excessive.
D. She is frustrated that most of her students are unaware of the phenomenon.
5.What comparison does the professor make involving phosphorus and nitrogen?
A. Sediment on the ocean floor contains more nitrogen than phosphorus.
B. The atmosphere contains more nitrogen than phosphorus.
C. Nitrogen requires more time to get recycled than phosphorus does.
D. Phosphorus is more important than nitrogen to the development of fish.
6.What does the professor mean when she says this?
A. She realizes that the students are struggling with the concept.
B. She is surprised that the student knew the answer to her question.
C. She thinks that the answer to the question is obvious.
D. She thinks that this phase of the cycle has an unusual name.