Explain the formation of patterned ground
What will be an ideal response?
Answer: Patterned ground is a periglacial phenomenon common to the tundra. They form in the active layer because of freeze and thaw and sometimes form polygons. Other times they are caused by growing wedges of ice in the active layer.
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What is the difference between a prezygotic reproductive barrier and a postzygotic reproductive barrier? Provide an example of each
What will be an ideal response?
Why didn't ice gather in central and northern Alaska in the last ice age?
A) Proximity to the sea kept it too warm. B) The climate at that time was tropical. C) There was too little precipitation. D) There was too much geothermal heating from volcanic action.
Ice ages
A) have not occurred for several million years. B) have not affected North America. C) have been more severe because of plate tectonics. D) are more severe when the continents are closer to the equator. E) all of the above
Which of the following is true of the chemical composition of seawater?
A) The highest salinity values of seawater are found near landmasses and at higher latitudes. B) The chemical properties of seawater show very little latitudinal variability, though some minor variability with depth. C) Eighteen elements account for 75% of the dissolved matter in seawater. D) Samples of ancient seawater suggest a great deal of chemical variation over the Earth's history. E) Seawater contains dissolved gases, suspended and dissolved organic matter, and many trace elements.