Igneous Rocks

What are the processes that form an igneous rock?

• Melting (or cooling) and Solidification of Magma

• Heat and Pressure

• Weathering and Erosion

• Compaction and Cementation

Slow cooling of magma will produce what size crystals?

• Large (seen without a magnifying glass)

• Small (need a magnifying glass to see crystals)

Tags

NGSS.MS-PS1-4

Fast or Instant cooling of lava will produce what size crystals?

• Large (seen without a magnifying glass)

• Small (need a magnifying glass to see crystals)

Tags

NGSS.MS-PS1-4

Small or No crystals at all within an igneous rock is formed when lava cools...

• Quickly

• Slowly

Large or massive crystals within an igneous rock is formed when magma cools...

• Quickly

• Slowly

Small crystals that form from fast cooling of lava are found where?

• Deep inside the planet

• At the surface

Large or massive crystals that form from slow cooling of magma are found where?

• Deep inside the planet

• At the surface

Igneous rocks with small crystals are found at the surface of Earth. The environment of formation is

• Intrusive

• Extrusive

Igneous rocks with large crystals are found deep within the Earth. The environment of formation is

• Intrusive

• Extrusive

Crystal size within an igneous rock has a special term. That term is....

• Texture

• Shiny

• How it feels

• Subduction