This figure shows a disconformity between an upper dark layer (being deposited by the sea) and a lower light-colored layer. What happened to form this disconformity?
A. The lower limestones were converted into another rock type by seawater.
B. The lower layers were tilted and untilted before deposition of the upper layers.
C. The upper layer must have been deposited by volcanic eruptions.
D. The boundary between the two units indicates that for a time there was either erosion or no deposition.
Answer: D
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The western part of East Asia has an arid climate because
A. It has deserts B. It has many high mountain ranges C. It is furthest away from the rain bearing winds from the ocean. D. It is composed mainly of high plateaus.
Biodiversity is important because
A) it is necessary to maintain stability of ecosystems. B) humans can use new sources of food. C) if certain species decline, photosynthesis may not be possible. D) if certain species decline, there would be too much oxygen in the atmosphere.
Lactate dehydrogenase belongs to which group of enzymes?
A) hydrolases B) lyases C) oxidoreductases D) transferases
Most Latin American countries are in the second or early third stages of the demographic transition. What does this imply about their birth and death rates? a. Birth and death rates are low
b. Birth and death rates are high. c. Birth rates are high but declining, and death rates are low. d. Birth rates are low but increasing, and death rates are low. e. Birth rates are high, and death rates are high but decreasing.