How do buried pollen grains tell researchers about climate in the past?
What will be an ideal response?
Seed-bearing plants produce pollens, and botanists can examine them to determine which plants produced them. Some pollen graintss that are buried in the sediments of wetlands and lake bottoms have been preserved for millions of years. By examining them, scientists can reconstruct the plant community that existed in a given area centuries ago. This in turn gives clues to what kind of climate existed there.
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Loess is transported by ________ and is important because ________.
A) flowing streams; it tends to braid streams and dam the water B) mass-wasting processes down slopes; it can cause debris avalanches C) wind around glaciers; it is fertile D) flowing streams; erodes very quickly
Which rock types are found along passive continental margins?
a. sandstone and granite b. limestone and granite c. sandstone, shale, and limestone d. komatiites and ophiolites e. ophiolites
The Proterozoic comprises what percentage of geologic time?
a. 12 percent d. 42 percent b. 19 percent e. 65 percent c. 35 percent
An isotherm bends towards the equator as it passes over land. One can infer ________
A) the season is summer B) the season is fall C) the season is winter D) the season is spring E) it is warmer over the land than the ocean