What are the four factors that affect stream velocity and how will they affect the flow?
What will be an ideal response?
Answer:
1) Gradient = slope of a stream channel. The steeper the gradient, the more gravitational energy there is to drive flow
2) Channel shape = the cross-sectional shape of the channel, which determines the amount of flow in contact with the banks and bed of the channel. The most efficient channel is the one with the smallest wetted perimeter, so the smallest frictional drag on the water.
3) Channel Size and Roughness = how the water flow will be affected by frictional resistance of the channel. The more frictional, the slower the flow.
4) Discharge = the volume of water passing a point in a given time. When discharge increases, flow velocity increases.
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Environmental regulation has largely failed to reduce pollution from mining
Indicate whether the statement is true or false
Sustainable mineral use and longer projected lifetimes for scarce minerals can be achieved with all of the following, except ________
A) finding more available substitutes for scarce minerals B) increasing demand and lowering prices for products using these minerals C) researching more efficient and environmentally friendly techniques of extraction D) exploring for new reserves E) recycling
Archaea may be any of the following except
A) prokaryotes. B) chemoautotrophs. C) extremophiles. D) eukaryotes.
Another name for a ________ boundary is a destructive boundary
A) convergent B) divergent C) transform