What sequence of events would have to occur in order to produce the unconformity shown here?
What will be an ideal response?
Answer: First the lower units (purple/white) would have had to be deposited as horizontal layers. Then they got folded. The top got eroded off by some amount. A layer of pebbles was deposited atop this eroded surface (making it an angular unconformity), and then some shale or other fine-grained sediment was deposited on top of that. Finally, I suppose, something had to erode or cut into all three layers and the unconformity to expose the cross-sectional view we see here.
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On a meandering stream, maximum erosion takes place along the ______.
a - places with the slowest flow b - bottom c - outer edge of the meanders d - islands e - inner edge of the meanders
________ pollutants are emitted directly into the air
Fill in the blank(s) with correct word
By design, the molecules that resist biodegradation and include some of the most problematic persistent organic pollutants are the
A) synthetic organic compounds. B) inorganic compounds. C) recycled organic compounds. D) chlorinated heavy metals.
A biome is a large, stable community of plants and animals whose boundaries are closely linked to climate
Indicate whether the statement is true or false