« previous next »

Author Question: In what basic settings do intrusive and extrusive igneous rocks originate? What will be an ideal ... (Read 99 times)

lindiwe

  • Hero Member
  • *****
  • Posts: 577
on: Jul 14, 2018
In what basic settings do intrusive and extrusive igneous rocks originate?
 
  What will be an ideal response?

Question 2

How does the rate of cooling influence crystal size? What other factors influence the texture of igneous rocks?
 
  What will be an ideal response?


shayla

  • Sr. Member
  • ****
  • Posts: 323
Reply #1 on: Jul 14, 2018
Answer to Question 1

Intrusive rocks originate from cooled and crystallized magma at some depth within the Earth. Extrusive rocks originate from cooled and crystallized lava at the Earth's surface.

Answer to Question 2

Slow rates of cooling allow greater time for crystals to form, so that tends to favor larger crystal size. Fast rates of cooling do not allow time for mineral crystals to form, so the faster the rate, the smaller the crystal size. The composition of the magma or lava and the amount of dissolved gases present also influence crystallization.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.

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?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Basic features of the function of many excretory systems. Basic features of the function of many excretory systems.
Basic overview of energy and human life. Basic overview of energy and human life.
Horses too young to be ridden are trained to accept a halter, taught basic skills, manners, and beco Horses too young to be ridden are trained to accept a halter, taught basic skills, manners, and beco
The Number of Children Americans Think Are Ideal The Number of Children Americans Think Are Ideal
Rocks are Aggregates of Minerals Rocks are Aggregates of Minerals
Sheeting and Exfoliation of Igneous Rocks Sheeting and Exfoliation of Igneous Rocks
Video: Summation - defined, spatial, temporal & AP generation or not

For a complete list of videos, visit our video library