Describe the characteristics of millennial-scale oscillations
What will be an ideal response?
Answer: Data for the last 12,000 years show a definite 1,500-year cycle in solar radiation that matches well with debris deposited on the floor of the North Atlantic by icebergs. This has led some researchers to conclude that solar forcing underlies at least part of the temperature changes observed in the Holocene.
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What is the most precise and efficient irrigation method?
A. precision application sprinklers B. flood C. drip D. canals E. center pivot sprinklers
How has discovery of these minute phytoplankton changed our understanding of marine food webs?
1.No change, as they’re too small to be eaten by anything.
2.The base of the food web has organisms much smaller than diatoms.
3.Their growth is usually limited by nutrients, hence they’re unimportant.
4.They are actually eaten by all marine life.
________ is molten rock that is below the Earth's surface and retains most of its volcanic gases
A) Lava B) Pumice C) Magma D) Volatiles
The presence of polar ice caps reflects unusually heavy precipitation from the cold air at the poles.
Answer the following statement true (T) or false (F)