Question

1. question 78 refers to the layers of the earths atmosphere as shown below. which layer is the region where uvc is filtered out? (a) a (b) b (c) c (d) d (e) e 79. in 1989, the exxon valdez spilled 10.8 million gallons of crude oil into prince william sound in alaska. what happened to most of the oil? (a) it was cleaned up by exxon. (b) it eventually evaporated into the air. (c) it sank into the ground. (d) it biodegraded and photolyzed. (e) it dispersed into the water column.

Explanation:

1. For question 78: The stratosphere (layer B) contains the ozone layer which filters out UVC radiation. Ozone absorbs UVC, protecting life on Earth.
2. For question 79: After the Exxon Valdez oil - spill, most of the oil biodegraded and photolyzed over time. Microorganisms break down the oil through biodegradation, and photolysis occurs due to the action of sunlight on the oil.

Answer:

1. B. Stratosphere
2. D. It biodegraded and photolyzed.