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1. Once a rock forms as part of a mountain, it does not change. 2. Some rocks, when exposed on Earth’s surface, undergo weathering and erosion. Do you agree or disagree?. Lesson 1 - Now. Igneous Rocks. How do igneous rocks form? What are the common types of igneous rocks?.

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lesson 1 now
1. Once a rock forms as part of a mountain, it does not change.

2. Some rocks, when exposed on Earth’s surface, undergo weathering and erosion.

Do you agree or disagree?

Lesson 1 - Now
lesson 2 reading guide kc

Igneous Rocks

  • How do igneous rocks form?
  • What are the common types of igneous rocks?
Lesson 2 Reading Guide - KC
lesson 2 reading guide vocab

Igneous Rocks

  • extrusive rock
  • volcanic glass
  • intrusive rock
Lesson 2 Reading Guide - Vocab
lesson 2 1

Igneous Rock Formation

  • When volcanic material erupts and cools and crystallizes on Earth’s surface, it forms a type of igneous rock called extrusive rock.
  • Volcanic glass is rock that forms when lava cools too quickly to form crystals.
  • Among the most noticeable features of some extrusive igneous rocks are holes that are left after gas escapes.
Lesson 2-1
lesson 2 11

Igneous Rock Formation(cont.)

Igneous rocks that form as magma cools underground are called intrusive rocks.

intrusive

from Latin intrudere, means “to push in”

Lesson 2-1
lesson 2 2

Igneous Rock Formation(cont.)

How do igneous rocks form?

Lesson 2-2
lesson 2 22

Igneous Rock Identification

  • If the crystals are small, the rock is extrusive.
  • If all the crystals are large enough to see and have an interlocking texture, the rock is intrusive.
Lesson 2-2
lesson 2 23

Igneous Rock Identification(cont.)

  • Igneous rocks are also classified, in part, by magma composition, such as silica content.
  • Magma composition, the location where the lava or magma cools and crystallizes, and the cooling rate determine the type of igneous rock that forms.
Lesson 2-2
lesson 2 24

Igneous Rock Identification(cont.)

How are extrusive and intrusive rocks different?

Lesson 2-2
lesson 2 vs

An extrusive igneous rock cools and crystallizes from volcanic material erupted on Earth’s surface.

  • When lava cools fast, volcanic glass forms.
  • An intrusive igneous rock forms as magma cools and crystallizes deep inside Earth.
Lesson 2 - VS
lesson 2 lr1

What erupts onto Earth’s surface during a volcanic eruption?

A. sediment

B. volcanic glass

C. pumice

D. magma

Lesson 2 – LR1
lesson 2 lr2

Which of these forms when lava cools too quickly to form crystals?

A. extrusive rock

B. intrusive rock

C. volcanic glass

D. magma

Lesson 2 – LR2
lesson 2 lr3

What kind of rock forms when magma cools underground?

A. intrusive

B. extrusive

C. crystallized

D. mineral

Lesson 2 – LR3
lesson 2 now

Do you agree or disagree?

3. Large crystals form when lava cools quickly on Earth’s surface.

4. Igneous rocks form when cooling magma crystallizes.

Lesson 2 - Now