1. Chapter 3
Lesson 2: Types of Rocks
4th Grade Science

2. Igneous Rocks Igneous Rocks
Formed from melted rock (magma)
If they cool slowly (millions of years) they have large grains of minerals.
Granite
Obsidian

3. Sedimentary Rocks Sediment Sedimentary Rocks Tiny pieces of rock/dirt
Formed when sediment is pressed together
Layers in Sedimentary rocks show the ages of the rock
Sandstone

4. Metamorphic Rocks Metamorphic Rocks
Rocks that change into different rocks
INTENSE heat and pressure changes rocks’ properties
Marble

5. Uses for Rocks Igneous Sedimentary Metamorphic
Granite – strong; used for buildings
Pumice – found in soaps
Sedimentary
Shale + Limestone = Cement
Metamorphic
Slate – Waterproof; used for roofs
Marble – Used in statues and carvings