Question

Describe how igneous rocks are formed. State their main characteristics.​

Answer 1

Answer:

Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.

Characteristics of Igneous Rocks

• Characteristics of Igneous RocksThe igneous form of rocks does not include any fossil deposits. ...
• Characteristics of Igneous RocksThe igneous form of rocks does not include any fossil deposits. ...Most of the igneous forms include more than one mineral deposit.
• Characteristics of Igneous RocksThe igneous form of rocks does not include any fossil deposits. ...Most of the igneous forms include more than one mineral deposit.They can be either glassy or coarse.
• Characteristics of Igneous RocksThe igneous form of rocks does not include any fossil deposits. ...Most of the igneous forms include more than one mineral deposit.They can be either glassy or coarse.These usually do not react with acids.

Answer 2

Answer:

Igneous rocks that form through a gradual cooling process tend to have large crystals. Relatively fast cooling of magma produces small crystals. Volcanic magma that cools very quickly on the Earth's surface can produce obsidian (see image link) glass which contains no crystalline structures.

The igneous form of rocks does not include any fossil deposits. If there are any chances of fossil deep inside the crust, it erupts out of the Earth’s surface and gets destroyed due to the sheer heat these rocks produce.

2) Most of the igneous forms include more than one mineral deposit.

3) They can be either glassy or coarse.

4) These usually do not react with acids.

5) The mineral deposits are available in the form of patches with different size.