What is the difference between elastic and plastic deformation? What type of deformation does a rock experience when an earthquake wave passes through it?
What will be an ideal response?
Elastic deformation occurs when an object returns to its original shape after being deformed. During plastic deformation the object does not return to its original shape after being deformed. When an earthquake wave passes through a rock, it undergoes elastic deformation.
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How extensive are the effects of human activities on the planet?
a. Humans have indirectly affected about 75% of the earth's land surface. b. Humans have caused great harm in the world's oceans, but not so much on land surfaces. c. Humans have directly affected about 75% of the earth's land surface. d. Humans have directly affected about 83% of the earth's land surface, including Greenland and Antarctica. e. Humans have directly affected about 83% of the earth's land surface, excluding Greenland and Antarctica
The bending of light as it passes around objects is referred to as ____
A) dispersion B) diffraction C) refraction D) reflection
Which of the following accurately describes 18O/16O ratios of the worlds oceans?
A) Because 18O evaporates more readily than 16O, the oceans have a higher relative abundance of 16O during warm periods and a more balanced ratio when there is less evaporation. B) The higher the ratio of oceanic 18O/16O, the warmer the temperatures because the 16O will have been mostly evaporated from ocean waters. C) During periods of colder temperature 16O is locked up in snow and ice and the oceans have a higher preponderance of 18O; during warmer periods the isotope ratio is lower. D) The 18O/16O ratio is low during colder temperatures because temperatures are too low for evaporation to be effective and both isotopes remain in the ocean.
The von Thunen model is a pattern of land use that emphasizes concentric rings from a central market. The placement of a particular agricultural activity within a specific ring is based upon the land rent of the commodity calculated principally according to ________.
A. market price and transport costs B. production subsidies for certain crops C. transport costs D. production subsidies for certain crops and market price E. market price