When are restoration efforts needed? Describe efforts underway to restore the Everglades
What will be an ideal response?
Restoration efforts are needed "to repair damage to specific lands and waters so that normal ecosystem integrity, resilience, and productivity return." The ecological problems that can be ameliorated by restoration include those resulting from soil erosion, surface strip mining, draining wetlands, coastal damage, agricultural use, deforestation, overgrazing, desertification, and the eutrophication of lakes. "The plan calls for removing 240 miles of levees and canals and creating a system of reservoirs and underground wells to capture water for release during the dry season. The new flowage is designed to restore the river of grass, thereby restoring the 2.4 million acres of Everglades not to original state, but at least to a healthy system."
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Lava rocks formed less than 800,000 years ago are found to have a different _____ than lava rocks formed over 1.5 million years ago.
A ) magnetic polarity B ) mineral composition C ) magnetic strength D ) precious metal content
You examine a rock that has large mineral crystals that are clearly visible. On those mineral crystals, you notice that there are numerous flat smooth surfaces, all oriented in the same directions within each specific mineral. The likely explanation for this is
A. the minerals are exhibiting cleavage surfaces. B. the minerals grew that way as the sediments were deposited. C. the minerals were forced into this orientation by the extreme heat and pressure associated with the formation of the rock. D. the minerals have grown into one another at exactly the same angles. E. None of these choices are correct.
Continental rifts have a diverse suite of igneous rocks associated with them because melting occurs
A. only in the crust. B. only in the mantle. C. in the mantle and in the crust.
Judge the following sentence according to the criteria given below: All marine algae must live near the ocean surface BECAUSE this is where food can be obtained
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.