All of the following agricultural practices leave significant parts of the land exposed to water runoff and soil erosion except
A) bare areas.
B) rows of sown crops.
C) compacted land surfaces.
D) terracing steep slopes.
Answer: D
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The Cascadia subduction zone off the coast of Washington and Oregon famously lacks a well-defined deep-ocean trench. Why might this be the case?
A) Compression from the convergent boundary has squeezed any potential trench closed. B) There is a massive amount of sediment fill from the Columbia River basin. C) The descending plate is warm and buoyant, so it subducts shallowly. D) There is a shallow angle of plate subduction, as well as large quantities of sediment infill.
What is the function of secondary messengers such as prostaglandins?
A) carry a message from one part of a cell to another part of the cell B) deliver signals from one part of the body to another C) mediate hormonal responses D) none of these