Earth 18

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Rocks and Rock Types

The previous topic introduced minerals. Here we explore rocks and rock types. A rock is a naturally occurring aggregate of minerals and/or mineraloids. The three categories are igneous, sedimentary, and metamorphic. Example of each are as follows: Igneous Rocks (Basalt. Gabbro. Granite. Obsidian. Volcanic Ash and Tuff); Sedimentary Rocks. (Clays, Mudstones and Shales. Limestones. Sandstone); Metamorphic Rocks (Gneiss. Marble. Quartzite. Schist. Slate).

Lesson 1 (or “Day 1”) Material
Lesson 2 (or “Day 2”) Material
Lesson 3 (or “Day 3”) Material
Lesson 4 (or “Day 4”) Material

3:45 Rock Types and the Rock Cycle: Igneous Sedimentary Metamorphic

2:21 WE WILL ROCK YOU! (The Rock Cycle)

4:38 3 Types of Rocks and the Rock Cycle: Igneous, Sedimentary, Metamorphic – FreeSchool

Compare Contrast and Debate

Kick-Off Debate Background: 

The rock-types found in different parts of the US vary – depending on location. Some people might suggest that primary emphasis should be given toward the type of rock local to a given area. This would make the study of rock relevant to students. Others might suggest that equal emphasis should be given toward all rock types, regardless of the location. This alternative viewpoint suggest students need to be exposed to rock types everywhere, not just those that are local.

  • Position A: Students should be exposed to the rock-type located nearest their area – with less emphasis about rock elsewhere.
  • Position B: Students should be exposed to a wide-variety of rock type, regardless of their location and the rock-type location.

Resources Documents and Links

Special Notes and Notices

Instructor Emphasis:

  • Science & Engineering Practice: Plan and conduct investigations.
  • Cross-Cutting Concept: Stability and Change.

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