Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water.

These rocks include: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff. Pictures and brief descriptions of some common igneous rock types are shown on this page.

That of extrusive being andesite , basalt,dacite, obsidian , pumice, tuff, scoria,rhyolite.

LIMESTONE: A sedimentary rock, it is used mainly in the manufacture of Portland cement, the production of lime, manufacture of paper, petrochemicals, insecticides, linoleum, fiberglass, glass, carpet backing and as the coating on many types of chewing gum. SHALE: A sedimentary rock, well stratified in thin beds.

What Are the Most Important Types of Rock in the Crust?

• Granite is great stuff! Not only is it my personal favorite, it is without a doubt the most common rock type on the continental land masses.
• Basalt is extrusive.
• As it turns out, most of the ocean floor is basalt, and most of the continents are granite.

The items in this case are just a few of the ways that we use rocks and minerals in our everyday lives. Gypsum is ubiquitous in our lives as the basis for drywall….

• 20,000 pounds of clay.
• 28,000 pounds of salt.
• 1,500,000 pounds of stone, sand, and gravel.
• 6,500 pounds of cement.
• 82,000 gallons of petroleum.

Rocks and minerals are all around us! They help us to develop new technologies and are used in our everyday lives. Our use of rocks and minerals includes as building material, cosmetics, cars, roads, and appliances. Rocks and minerals are important for learning about earth materials, structure, and systems.

Rocks have a broad range of uses that makes them significantly important to human life. For instance, rocks are used in construction, for manufacturing substances and making medicine and for the production of gas. Rocks are also extremely vital to scientists as they provide clues about the Earth’s history.

As strange as it sounds, rocks are made from stardust; dust blasted out and made from exploding stars. In fact, our corner of space has many rocks floating around in it. From really fine dust, to pebbles, boulders and house-sized rocks that can burn up in the night sky to make meteors or “shooting stars”.

You CaN eat rocks ( the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil or broken from cliffs, boulders etc…) The rocks might contain parasites or micro-organisms which can lead to more complications.

Rocks can grow taller and larger Rocks also grow bigger, heavier and stronger, but it takes a rock thousands or even millions of years to change. Water also contains dissolved metals, which can “precipitate” out of seawater or freshwater to grow rocks. These rocks are called concretions or nodules.

In 1999, the oldest known rock on Earth was dated to 4.031 ±0.003 billion years, and is part of the Acasta Gneiss of the Slave craton in northwestern Canada.