During the spring equinox in the northern hemisphere, the circle of illumination passes directly through the:
A) Tropic of Cancer.
B) Tropic of Capricorn.
C) poles.
D) equator.
C
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DDT, C14H9Cl5, is a very effective insecticide. It is hazardous to other species, however, because it tends to accumulate in the food chain. Shown above is its chemical structure. Suggest why it remains on plants and in soils for extended periods of time.
What will be an ideal response?
What is the process that changes compacted sediment into a rock?
- Crystallization
- Lithification
- Metamorphism
- Weathering
After the eruption of Mount St. Helens, Spokane, Washington,
A) saw its diurnal temperature cycle flatten out. B) saw its daytime temperatures increase sharply. C) saw its nighttime temperatures decrease sharply. D) saw a marked decrease in its outgoing amount of terrestrial radiation. E) did not have any significant changes in temperature.
Which of the following would be categorized as a cultural ecosystem service of forests?
A. Recreation and scenic areas for tourism B. Timber and landscape materials C. Mushroom and plant harvests D. Soil stabilization and air purification