This topic contains a solution. Click here to go to the answer

Author Question: What two types of locations are hot spots typically found in? What will be an ideal ... (Read 83 times)

mckennatimberlake

  • Hero Member
  • *****
  • Posts: 559
What two types of locations are hot spots typically found in?
 
  What will be an ideal response?

Question 2

What are the effects of tectonic shortening and stretching?
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

otokexnaru

  • Sr. Member
  • ****
  • Posts: 314
Answer to Question 1

Answer: 1. Large volumes of young volcanic rocks very far from plate boundaries. Examples are Hawaii and Yellowstone On average, about 0.1 cubic kilometer of lava erupts on the island of Hawaii each year. This is enough lava to bury San Francisco a meter deep each year and is more than 5 percent of the volume erupted along all of the world's mid-ocean ridges. This incredible eruption rate built huge shield volcanoes more than 9 kilometers above the seafloor. Yellowstone National Park marks a similarly prolific volcanic hot spot where 6000 cubic kilometers of magma erupted over the last 2 million years, mostly as rhyolitic tuff.
2. Unusually prolific volcanism along or near a divergent boundary. The volcanic activity is so excessive compared to typical mid-ocean ridges that the hot spot volcanoes commonly build up well above sea level. Iceland is an example of this type of hot spot. Scientists hypothesize that there must certainly be some mechanism other than normal divergent-margin processes to generate the excessive amounts of magma.

Answer to Question 2

Answer: Compressional stress shortens and thickens the crust by plastic flow in the lower crust and while forming reverse and thrust faults in the upper crust. The principle of isostasy requires the elevation of a shortened region to increase because the thickness of crust increasesTensional stress thins and stretches the lower crust by plastic flow, while normal faults form in the upper crust. Elevation decreases where the crust becomes thinner. A thinning of the continental crust produces a block that is lower in elevation and whose root shrinks. Isostasy explains why low-elevation rift valleys form where continents lengthen by tension. Isostasy also explains why continents have wide, submerged continental shelves. Continents separate from one another where divergent plate boundaries form. When tension stretches the crust at these divergent boundaries, the crust is also thinner, forming continental shelves with lower elevation than the interior of the continent (where the non-stretched crust remains thicker). The elevation of thinned crust is lower than sea level, causing submergence of part of the continental crust. This application of isostasy explains why a small area of Earth that is underlain by continental crust is also low enough the be covered by seawater.




mckennatimberlake

  • Member
  • Posts: 559
Reply 2 on: Jul 16, 2018
Gracias!


mammy1697

  • Member
  • Posts: 341
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.

For a complete list of videos, visit our video library