What are the 3 types of rocks and how do they form?

Answer 1

There are three major types of rocks; igneous, metamorphic and sedementary. Igneous rocks are formed when magma or lava cools and hardens. Metamorphic rocks are formed under heat and pressure deep inside earth's crust. Sedementary rocks form when sedements are deposited and are compacted and cemented into place.

Answer 2

Sedimentary rock- are formed by deposits of either organic matters or chemical evaporites.Followed by compaction,for different time peroids;like shale,mudstone and siiltstone.Sedimentary rocks are found usually close to the earths surface Metamorphic -these type of rocks are formed by subjection to exterme pressure and temperature;different from that of when they wwhere first formed.And it can happen to any rock type . Igneous-they sre formed when hot magma cools and is divided ,into two parts..Volcanic and plutonic rocks.Plutonic is the result of when magma cools and crystalizes slowly;within the crust of the earth.And the result could be something like granite.

Answer 3

1) Igneous: formed from the solidification of magma and lava.

2) Metamorphic: formed by changes in the structure, mineralogy, or chemistry of existing rocks, due to heat and/or pressure.

3) Sedimentary: formed by the accumulation and lithification of deposited sediments. Sedimentary rock can also be formed by the precipitation of minerals from saturated solutions.

Answer 4

Basalt is formed when lava comes out of a volcano and it cools quickly, it's an igneous rock

marble is formed when a rock comes down to a place with lots of het and pressure, it's a metamorphic rock

limestone is formed when lots of sediments pile on top of each other and become solid creating a sedimentary rock

Answer 5

igneous rock: is formed by volcanic activity and the cooling of magma or lava

sedimentary rock: is formed when particles of rocks pile up and the pressure of the particles on top cause the lower ones to stick together and harden into rock

metamorphic rock: is formed when another type of rock is subjected to intense heat and pressure

Answer 6

Igneous: These rocks are volcanic in nature. They are split into two categories in where they cool/crystallize: intrusive (internal) and extrusive (external). Intrusive volcanic rocks cool slowly, so they contain (usually) large crystals, like granites. Extrusive rocks are quite the opposite, in which they cool very quickly. This is where you get your obsidian glass and basalts. Sedimentary: These rocks are depositional and categorized by the kind of sediment it is made up of. Metamorphic: This can be the offspring rock of either a morphosed igneous or sedimentary rock. This metamorphism is accomplished by heat and/or pressure, and during a great length of time.

Answer 7

The three main types of rocks are sedimentary, metamorphic, and igneous and the differences among them have to do with how they are formed. Sedimentary rocks are formed from particles of sand, shells, pebble. An Igneous rock can be either intrusive or extrusive, it is cased by partial melting of existing rocks, this magma then migrates towards the surface, if it reaches the surface it will be erupted in a volcano. Basalt is an example of such a rock. If it doesn't reach the surface it will still cool into rock, but the process will take longer and the rock formed will have bigger crystals, granites and gabbros are both examples of such rocks.Metamorphic rocks can be both igneous or sedimentary in origin, but they have been subjected to high temperature, or pressure, or both. By burial or proximity to magma. Marble is an example of a metamorphosed limestone.

Answer 8

Igneous: These rocks are volcanic in nature. They are split into two categories in where they cool/crystallize: intrusive (internal) and extrusive (external). Intrusive volcanic rocks cool slowly, so they contain (usually) large crystals, like granites. Extrusive rocks are quite the opposite, in which they cool very quickly. This is where you get your obsidian glass and basalts. Sedimentary: These rocks are depositional and categorized by the kind of sediment it is made up of. Metamorphic: This can be the offspring rock of either a morphosed igneous or sedimentary rock. This metamorphism is accomplished by heat and/or pressure, and during a great length of time.

Answer 9

punk, hard, 80's

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