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

Author Question: How do magmas form at convergent plate boundaries? What will be an ideal ... (Read 99 times)

Frost2351

  • Hero Member
  • *****
  • Posts: 557
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
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
Great answer, keep it coming :)


bigcheese9

  • Member
  • Posts: 333
Reply 3 on: Yesterday
Excellent

 

Did you know?

IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Did you know?

Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

For a complete list of videos, visit our video library