« previous next »

Author Question: In what basic settings do intrusive and extrusive igneous rocks originate? What will be an ideal ... (Read 46 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?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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.

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?

Everyone has one nostril that is larger than the other.

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

Chemistry: basic skills Chemistry: basic skills
Basic Design of the Driving and Cell Phone Distraction Experiment Basic Design of the Driving and Cell Phone Distraction Experiment
Red rocks due to oxidation of iron near the surface Red rocks due to oxidation of iron near the surface
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
If CP for an ideal gas is 35.4 J/molK, which of the following is CV for this gas? If CP for an ideal gas is 35.4 J/molK, which of the following is CV for this gas?
Basic Chemical Structure of Amino Acids Basic Chemical Structure of Amino Acids
Video: Lipid digestion - mouth, stomach and small intestine

For a complete list of videos, visit our video library