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What are Common Igneous Rocks
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Igneous rocks are one of the three main types of rocks formed from the cooling and solidification of magma or lava. They are typically categorized into two main types based on where they solidify: intrusive (or plutonic) and extrusive (or volcanic). • Intrusive Igneous Rocks: These rocks form from magma that cools slowly beneath the Earth's surface, which allows large crystals to form. Common examples include: • Granite: A light-colored rock that is high in silica and contains quartz and feldspar. It is widely used in construction because of its durability and aesthetic appeal. • Diorite: Similar to granite but with a composition that is intermediate in silica content. • Gabbro: A dark, coarse-grained rock that is rich in iron and magnesium. • Extrusive Igneous Rocks: These rocks form from lava that cools quickly on the Earth's surface, resulting in fine-grained textures or even a glassy appearance due to rapid cooling. Common examples include: • Basalt: A dark, fine-grained rock that is the most common rock type on Earth's surface. It forms the ocean floor and volcanic islands. • Andesite: Intermediate in composition between rhyolite and basalt, often associated with volcanic activity at continental margins. • Rhyolite: A light-colored rock that is high in silica and often has a banded or glassy appearance. It is typically found in continental volcanic regions. • The composition of igneous rocks can vary widely and is often used to determine the conditions under which the rock formed. The texture of these rocks, including the size and arrangement of their crystals, provides important clues about their history and the rate at which they cooled. Igneous rocks are significant to geologists for understanding the Earth's geologic history and are also economically important as sources of minerals. • #rocks #geography #geology #geologists #earthmodel #moonmothgoddess #planets #planet #planetmotion #atmosfera #astronomija #physics #astrophysics #geocentric #physics #units #equivalents #science #planet #planets #stars #characteristics #earthatmosphere #earth #earthscience #earthsciences #earthschool #geologicalprocesses #geología #geologija #geologyrocks #igneous
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