What are examples of igneous rock?

What are examples of igneous rock?

• A. Shale and sandstone
• B. Granite and basalt
• C. Marble and slate
• D. Coal and dolomite

Answer: (B)

Igneous rocks are formed from the solidification of molten material called magma or lava. The two main types of igneous rocks are intrusive (plutonic) and extrusive (volcanic). Granite is an example of intrusive igneous rock, which forms when magma crystallizes slowly below the Earth's surface, allowing large crystals to form. Basalt, on the other hand, is an example of extrusive igneous rock, which forms when lava cools quickly on the Earth's surface, resulting in smaller crystals. The presence of these two rock types illustrates the key characteristics of igneous rocks, including their formation process and mineral composition. The other options consist of sedimentary and metamorphic rocks, which do not fall under the category of igneous rocks, and therefore they do not represent examples of this rock type.

Igneous rocks are formed from the solidification of molten material called magma or lava. The two main types of igneous rocks are intrusive (plutonic) and extrusive (volcanic). Granite is an example of intrusive igneous rock, which forms when magma crystallizes slowly below the Earth's surface, allowing large crystals to form. Basalt, on the other hand, is an example of extrusive igneous rock, which forms when lava cools quickly on the Earth's surface, resulting in smaller crystals.

The presence of these two rock types illustrates the key characteristics of igneous rocks, including their formation process and mineral composition. The other options consist of sedimentary and metamorphic rocks, which do not fall under the category of igneous rocks, and therefore they do not represent examples of this rock type.