This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: How do magmas form at convergent plate boundaries? What will be an ideal ... (Read 55 times)

Frost2351

  • Hero Member
  • *****
  • Posts: 557
on: Jul 16, 2018
How do magmas form at convergent plate boundaries?
 
  What will be an ideal response?

Question 2

The rock cycle describes recycling on a planetary scale. How might our 4.5-billion-year-old Earth differ if there was no rock cycle? Here are some ideas to consider in your answer: land elevation, depth of the oceans, and variability of rocks.
 
  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

Jevvish

  • Sr. Member
  • ****
  • Posts: 326
Reply #1 on: Jul 16, 2018
Answer to Question 1

The melts that form at a convergent plate boundary mostly originate in the asthenosphere above the subducting plate, because the melting temperature of the asthenosphere peridotite is reduced by injection of water released from metamorphism of the subducted crust.

Answer to Question 2

Little topographic difference (no mountains forming; any primitive mountains were weathered away); oceans accumulated great volumes of sediment (e.g., average continental margin sedimentation rate is 5 cm/ k.y. over 4.56 b.y. equals 228 km, enough to fill the oceans over 40 times). There would be little variation in igneous rocks because of the lack of mixing of magma and subducted plate and sediments.


Frost2351

  • Member
  • Posts: 557
Reply 2 on: Jul 16, 2018
Wow, this really help

juliaf

  • Member
  • Posts: 344
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

Did you know?

Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

Did you know?

Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

Ice-wedges form netlike polygons on the surface of the tundra, aerial photo of polygonal peat platea Ice-wedges form netlike polygons on the surface of the tundra, aerial photo of polygonal peat platea
The nonionic form does not occur in significant amounts in aqueous solutions The nonionic form does not occur in significant amounts in aqueous solutions
Pairs of heavy and light chains combine to form a Y-shaped molecule Pairs of heavy and light chains combine to form a Y-shaped molecule
Instructions for Completing the CMS-1500 (02/12) Claim Form Continued Instructions for Completing the CMS-1500 (02/12) Claim Form Continued
Effect of pH on drug absorption: (a) A weak acid such as aspirin (ASA) is in a nonionized form in an ... Effect of pH on drug absorption: (a) A weak acid such as aspirin (ASA) is in a nonionized form in an ...
How to visualize division in the Odds form of Bayes's Theorem? How to visualize division in the Odds form of Bayes's Theorem?
Video: Red alga life cycle Animation

For a complete list of videos, visit our video library