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Ck units formed from sediments deposited in horizontal layers? (1) A and B (2) B and C (3) C and D (4) D and E 14. A nonvesicular rock is made entirely of green 2-millimeter-diameter crystals that have a hardness of 6.5 and show fracture, but not cleavage. The rock is most likely (1) shale (2) phyllite (3) dunite (4) schist 15. Which texture best describes an igneous rock that formed deep underground? (1) glassy (2) vesicular (3) fine grained (4) coarse grained 16. Mineral crystals of quartz, bi.

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  4. Move on to the pre-test questions. Answer question 1 by clearly stating the difference between extrusive and intrusive igneous rocks.
  5. Proceed to question 2. List at least three properties used to identify minerals. Ensure you write them clearly and separately.
  6. Continue with question 3. Describe the process of how mineral crystals grow, providing a concise yet informative answer.
  7. For question 4, select the type of rocks formed by intense heat and pressure deep inside the Earth’s crust. Choose from the options provided.
  8. Answer question 5 by indicating the correct statement regarding obsidian’s glassy texture. Choose the right option from the multiple answers given.
  9. Question 6 requires you to identify the group of minerals that contain the most abundant metallic element in Earth's crust. Tick the correct group.
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Related content

What are igneous rocks? - USGS
Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and...
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Intrusive and Extrusive Rocks - Hyperphysics
Igneous rocks which form by the crystallization of magma at a depth within the Earth are...
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Extrusive igneous rocks have a fine-grained or aphanitic texture, in which the grains are too small to see with the unaided eye. The fine-grained texture indicates the quickly cooling lava did not have time to grow large crystals. These tiny crystals can be viewed under a petrographic microscope [1].

Extrusive (or, volcanic) igneous rocks are formed on the Earth's surface as the result of volcanic activity. They tend to have small crystal sizes because they cool very quickly. These small crystals are referred to as aphanitic because they often cannot be seen with the naked eye.

Igneous rocks (derived from the Latin word for fire, ignis) can have very different mineral backgrounds, but they all share one thing in common: they formed by the cooling and crystallization of a melt.

Intrusive igneous rocks are rocks that crystallize below the earth's surface resulting in large crystals as the cooling takes place slowly. Diorite, granite, and pegmatite are examples of intrusive igneous rocks.

Summary Intrusive igneous rocks cool from magma slowly in the crust. They have large crystals. Extrusive igneous rocks cool from lava rapidly at the surface. They have small crystals. Texture reflects how an igneous rock formed.

Extrusive (Volcanic) Rocks Volcanic rocks have generally smaller crystal size and usually have a very-fine-grained or glassy groundmass that formed due to rapid cooling at the time of eruption.

Summary Intrusive igneous rocks cool from magma slowly in the crust. They have large crystals. Extrusive igneous rocks cool from lava rapidly at the surface. They have small crystals. Texture reflects how an igneous rock formed.

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Form Packages
Adoption
Bankruptcy
Contractors
Divorce
Home Sales
Employment
Identity Theft
Incorporation
Landlord Tenant
Living Trust
Name Change
Personal Planning
Small Business
Wills & Estates
Packages A-Z
Form Categories
Affidavits
Bankruptcy
Bill of Sale
Corporate - LLC
Divorce
Employment
Identity Theft
Internet Technology
Landlord Tenant
Living Wills
Name Change
Power of Attorney
Real Estate
Small Estates
Wills
All Forms
Forms A-Z
Form Library
Customer Service
Terms of Service
Privacy Notice
Legal Hub
Content Takedown Policy
Bug Bounty Program
About Us
Blog
Affiliates
Contact Us
Delete My Account
Site Map
Industries
Forms in Spanish
Localized Forms
State-specific Forms
Forms Kit
Legal Guides
Real Estate Handbook
All Guides
Prepared for You
Notarize
Incorporation services
Our Customers
For Consumers
For Small Business
For Attorneys
Our Sites
US Legal Forms
USLegal
FormsPass
pdfFiller
signNow
airSlate WorkFlow
DocHub
Instapage
Social Media
Call us now toll free:
+1 833 426 79 33
As seen in:
  • USA Today logo picture
  • CBC News logo picture
  • LA Times logo picture
  • The Washington Post logo picture
  • AP logo picture
  • Forbes logo picture
© Copyright 1997-2025
airSlate Legal Forms, Inc.
3720 Flowood Dr, Flowood, Mississippi 39232