Geoscience Unit 4

0.0(0)
Studied by 0 people
call kaiCall Kai
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
GameKnowt Play
Card Sorting

1/11

encourage image

There's no tags or description

Looks like no tags are added yet.

Last updated 12:12 AM on 3/5/26
Name
Mastery
Learn
Test
Matching
Spaced
Call with Kai

No analytics yet

Send a link to your students to track their progress

12 Terms

1
New cards

What is an igneous rock?

Is a type of rock that forms when melted rock cools and solidifies. (fresh & new rocks)

2
New cards

How are igneous rocks formed?

Forms from the solidification of melt. Melt is classified as magma when it is underground and lave when it erupts onto the surface.

3
New cards

Magma

melts underground

4
New cards

Lava

melt erupted onto the surface

5
New cards

Intrusive

Cooling & crystallization of magma underground (plutonic)

6
New cards

Extrusive

Cooling & crystallization of melt materials at the surface (volcanic)

7
New cards

How are igneous rocks described?

We mainly focus on minerals composition and texture.

Composition= what minerals they’re made of

Texture= glassy, fine-grained, coarse-grained, or bubbly (vesicular)

8
New cards

How are igneous rocks classified?

By their composition/silica content (SiO2)

9
New cards

Percentage of Ultramafic

Less than 45% of silica (rich in Fe & Mg)

They look green/jet black

10
New cards

Percentage in Mafic

45-55% silica (Fe & Mg rich, dark color) EX: Basalts & gabbros

11
New cards

Percentage in Intermediate

55-65% silica (dark ferromagnesian & light si-rich)

12
New cards

Percentage in Felsic

More than 65% silica (lighter in color)