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

Author Question: Natural glass such as obsidian forms when ____. A)magma cools too rapidly for crystals to form ... (Read 211 times)

rlane42

  • Hero Member
  • *****
  • Posts: 594
on: Jul 13, 2018
Natural glass such as obsidian forms when ____.
 A)magma cools too rapidly for crystals to form
 B)pegmatite melts, moves to Earth's surface and ,re-forms
 C)magma cools too slowly for crystals to form
 D)magma has a very low silica content
 E)gas escapes through lava

Question 2

Stromatolites are the product of organic activity.
  Indicate whether the statement is true or false


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Smiles0805

  • Sr. Member
  • ****
  • Posts: 305
Reply #1 on: Jul 13, 2018
Answer to Question 1

A

Answer to Question 2

True


rlane42

  • Member
  • Posts: 594
Reply 2 on: Jul 13, 2018
:D TYSM

amcvicar

  • Member
  • Posts: 341
Reply 3 on: Yesterday
Gracias!

« previous next »
 

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?

There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

Did you know?

The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

Did you know?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Examples of the results of sexual selection, a type of natural selection. Examples of the results of sexual selection, a type of natural selection.
Alternative forms of surgeries involving the uterus, ovaries, and fallopian tubes. The solid lines i Alternative forms of surgeries involving the uterus, ovaries, and fallopian tubes. The solid lines i
Instructions for Completing the CMS-1500 (02/12) Claim Form Continued Instructions for Completing the CMS-1500 (02/12) Claim Form Continued
Common Root Words and Combining Forms Cont. Common Root Words and Combining Forms Cont.
Peptide bond as resonance hybrid of two forms Peptide bond as resonance hybrid of two forms
Three active forms of vitamin A: all-trans-retinol, -retinal, and –retinoic acid Three active forms of vitamin A: all-trans-retinol, -retinal, and –retinoic acid
Video: Brief Summary on Photosynthesis - Animation

For a complete list of videos, visit our video library