Igneous Rocks - Jenisha

How are igneous rocks formed?

• magma cools down and solidifies

• making the sediment by breaking down or dissolving preexisting rocks or living organisms

• lot of heat and pressure change existing rocks into new types without melting or burning them.

Where is the word Igneous derived from?

• Greek - 'Igni' meaning light

• France - 'ingi' meaning fire

• Latin - 'ignis' meaning fire

• Latin - 'igni' meaning fire

What are the 2 different types of Igneous rocks?

• Instrusive rocks

• Excrusive rocks

• Intrusive and Extrusive rocks

What are intrusive igneous rocks?

• smaller crystal size and usually have a very fine-grained or glassy groundmass that is formed due to rapid cooling at the time of eruption.

• The rocks that cool below the surface of the earth.

What are extrusive igneous rocks?

• smaller crystal size and usually have a very fine-grained or glassy groundmass that is formed due to rapid cooling at the time of eruption.

• The rocks that cool below the surface of the earth

Fill in the blanks:-

Igneous rocks were the _____to be formed and thus are also known as _____ rocks.

• First, Sedimentary

• Second, Sedimentary

• First, Igneous

• First, Primary