« previous next »

Author Question: In what basic settings do intrusive and extrusive igneous rocks originate? What will be an ideal ... (Read 75 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?

It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

Did you know?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Did you know?

According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

Did you know?

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

Basic overview of energy and human life. Basic overview of energy and human life.
The basic structure of the IL-2 receptor. The basic structure of the IL-2 receptor.
Basic Food Groups and Their Major Nutrients (Continued) Basic Food Groups and Their Major Nutrients (Continued)
genetic code: The basic principle of translation genetic code: The basic principle of translation
Balance the given redox reduction equation in basic solution using the half reaction method Balance the given redox reduction equation in basic solution using the half reaction method
Video: Helper T cell receptors, activation, proliferation, differentiation & action

For a complete list of videos, visit our video library