The domestication of plants and animals allowed humans to alter ecosystems for their benefits. Which of the following is an example of a human benefit that resulted from ecosystem change?
A) Crop production increased and more people had food to eat.
B) Crop production decreased as natural habitats were replaced.
C) Grasslands were destroyed and predator insects were destroyed.
D) Grasslands were destroyed and replaced with forests.
E) Crop production increased as a result of more plants competing for the same land space.
A
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In the seventeenth century, Archbishop James Ussher of Ireland used the Bible to calculate that the Earth was created in 4004 b.c.e. Imagine you could take Archbishop Ussher to Niagara Falls
Although Niagara Falls is located on the border between the United States and Canada today, it was located several kilometers to the north at the Niagara Escarpment and is eroding southward. Let's assume the rate of erosion is 50 cm/yr. Assuming the distance from the Niagara Escarpment to Niagara Falls is 11 km, use the equation Rate = Distance/Time to calculate how long it would have taken to erode from the Escarpment to the current location of the falls. How would this calculation compare with Archbishop Ussher's assessment of the age of the Earth? What will be an ideal response?
Many gardeners know that, when a frost is expected, plants can be protected by covering them with large plastic tubs. Explain why this is an effective way of protecting plants from frost
What will be an ideal response?
Deposits of silt carried by blowing winds are referred to as ________
A) deflation deposits B) loess C) eolian sands D) alluvium
Compaction of soil in a garden harms plants by ________
A) increasing aeration, increasing infiltration, and decreasing runoff B) decreasing aeration, increasing infiltration, and decreasing runoff C) decreasing aeration, decreasing infiltration, and increasing runoff D) increasing aeration, decreasing infiltration, and increasing runoff