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.
A
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Intensity of regional metamorphism may be recognized by the index ____
A)crystals B)fossils C)minerals D)ores E)rocks
You want to maintain a healthy pond at your school site. Last year another pond became eutrophic; to avoid that, you want to ________
A) provide nitrogen for good nutrient mixing in the benthic zone B) increase the ozone in the littoral zone C) avoid increasing phosphorus runoff into the limnetic zone D) decrease the calcium available in the profundal zone E) increase the carbon-based fertilizers in the littoral zone
Much of Earth's water supply originated from
A) asteroids. B) icy comets. C) gases expelled from the Sun; i.e., solar wind. D) photosynthesis.
Earthquakes can cause tsunamis
Indicate whether the statement is true or false