What are the properties of the igneous sedimentary and metamorphic rocks?

Answer 1

Igneous rock is formed when molten rock cools. Examples are lava from volcanoes cooling but also rock that is pushed from the magma layer into cooler pockets under the surface of the Earth. They are characterised by having crystals in them. The larger the crystal the longer it took to cool down and form a solid.

Sedimentary rocks are formed when small particles (sediments from weathering and erosion) are deposited at a particular site - usually the slow running bits of river. These particles are, over millions of years, pushed together so much that any water in between the particles is pushed out and the particles get cemented together. A typical characteristic of sedimentary rock is that if you scratch it the particles will be scraped off and that they absorb water. They can also contain fossils.

Metamorphic rock is formed when sedimentary, igneous or other metamorphic rock ends up, because of plate movement, in a position where it is exposed to high pressure and temperature. This changes the nature of the original rock into something new. Characteristics of metamorphic rock is that there are no crystals or visible grains, it doesn't absorb water and is quite hard.

Answer 2

Igneous rock is formed when molten rock cools. Examples are lava from volcanoes cooling but also rock that is pushed from the magma layer into cooler pockets under the surface of the Earth. They are characterised by having crystals in them. The larger the crystal the longer it took to cool down and form a solid.

Sedimentary rocks are formed when small particles (sediments from weathering and erosion) are deposited at a particular site - usually the slow running bits of river. These particles are, over millions of years, pushed together so much that any water in between the particles is pushed out and the particles get cemented together. A typical characteristic of sedimentary rock is that if you scratch it the particles will be scraped off and that they absorb water. They can also contain fossils.

Metamorphic rock is formed when sedimentary, igneous or other metamorphic rock ends up, because of plate movement, in a position where it is exposed to high pressure and temperature. This changes the nature of the original rock into something new. Characteristics of metamorphic rock is that there are no crystals or visible grains, it doesn't absorb water and is quite hard.

Answer 3

Sedimentary (as in sediment) rocks are sometimes grainy, they're made when different layers of pebbles, sand and such, are all compacted together by pressure, so they usually have layers, and limestone (a sedimentary rock that dissolves in vinegar, or any type of acid) commonly contains fossils.

Igneous (as in ignite or fire, igne) rocks are formed when a volcano erupts, and the molten rock, known as lava above the earth's surface, (magma, below the earth's surface) cools and forms a new rock from the previous melted one. Igneous usually contains bubbles, because air bubbles in the liquid rock get trapped in the rock, when it cools. Pumice, is extremely light (due to it cooling before the air bubbles escape) is the only rock in the world that floats. Granite, however, does not contain bubble, and is used commonly as building material.

Metamorphic (as in morph, to change) rocks are created when either igneous or a sedimentary , or even another metamorphic rock, are put under tremendous pressure and heat, deep within the earth. Quartzite (used to be limestone) is an example of metamorphic rock, and so is marble, but sadly, I cannot truly remark any characteristics about this one.

Do NOT under any circumstance, use this information for anything serious, I am just answering your question to the best of my ability, and this info maybe wrong, as I am not the smartest man on earth.

Answer 4

Igneous rocks are either intrusive, which means they have been formed inside the Earth, or extrusive, meaning they have been formed by molten rock cooling down outside the earth. The intrusive ones will have been cooled slowly, and will have large crystals. The extrusive ones will have been cooled quickly, therefore, they will have small crystals. There is no pattern to the crystals in igneous rocks. E.g. Granite and Basalt. Sedimentary ricks will have benn formed from when the sediment under the sea has been forced together, these rocks are quite crumbly and loose. E.g. Chalk and Sandstone. Metamorphic rocks will have been formed because of the effect of extreme pressures and temperatures within the earth, they are hard and smooth, and have crystals in layers. E.g. Slate and Marble.