What are the three main types of rocks?

What are the three main types of rocks?

• A. Granite, sandstone, limestone.
• B. Igneous, sedimentary, and volcanic rocks.
• C. Igneous, sedimentary, and metamorphic rocks.
• D. Hard rocks, soft rocks, and fluid rocks.

Answer: (C)

Rocks are grouped into three main types based on how they form. Igneous rocks come from cooled molten material, either underground as intrusive rocks or on the surface after volcanic eruptions. Sedimentary rocks form when layers of sediment settle, compact, and cement together, or when minerals precipitate from water. Metamorphic rocks start as existing rocks and change under heat and pressure deep within the Earth, creating new textures and minerals. Examples help you see these: granite is an igneous rock, sandstone and limestone are sedimentary, and marble is metamorphic. The other options don’t fit as the main categories: listing specific rocks mixes types, calling volcanic rocks a separate type isn’t correct because volcanic rocks are igneous, and terms like hard, soft, and fluid rocks aren’t scientific classifications.

Rocks are grouped into three main types based on how they form. Igneous rocks come from cooled molten material, either underground as intrusive rocks or on the surface after volcanic eruptions. Sedimentary rocks form when layers of sediment settle, compact, and cement together, or when minerals precipitate from water. Metamorphic rocks start as existing rocks and change under heat and pressure deep within the Earth, creating new textures and minerals.

Examples help you see these: granite is an igneous rock, sandstone and limestone are sedimentary, and marble is metamorphic. The other options don’t fit as the main categories: listing specific rocks mixes types, calling volcanic rocks a separate type isn’t correct because volcanic rocks are igneous, and terms like hard, soft, and fluid rocks aren’t scientific classifications.