Explain how rivers construct deltas. Then, speculate as to why the mighty St. Lawrence River—draining the Great Lakes—does not have a delta
What will be an ideal response?
Answer: Rivers reach base level and lose some of their competence because of slower flow. Some sediments must be dropped. If there are enough sediments dropped then then main channel starts to clog and the river forms many channels in a delta-shape as it fans out over the dropped sediments. The St. Lawrence has not delta because its sediment load is very small compared to its discharge—materials do not need to be dropped.
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Given what you know about surface productivity, where do you think that sunlight penetrates deepest into the ocean?
a) Coastal waters on the west coast of North America b) Lagoons in the South Pacific c) In the open ocean d) Along the equator e) Surrounding Antarctica
Aquaculture has been beneficial in enhancing productivity, but may have negative effects by ____
A) ?increasing damage to structures from wind and wave energy in submerged pens B) ?concentrating farmed fish waste through open-ocean systems C) ?reducing the genetic diversity of wild fish from escapes D) ?increases the amount of wasted feed by moderating the number of farmed fish in each pen
The wavelengths of radiation that an object emits depend primarily on the object's ____
A) temperature B) photons C) density D) reflective surfaces
List the properties that determine the rate of degradation of toxicants
What will be an ideal response?