The Rock Cycle

Sedimentary, metamorphic, igneous rocks

Chalk

Chalk is a sedimentary rock. How is classified Is that a form of limestone composed of the mineral calcite. Calcite is calcium carbonate or CaCO3, a compound. Chalk is form under reasonable deep marine conditions from the gradual accumulation of minute calcite plates shed from micro-organisms called coccolithophores. Chalk has many purposes. It can be used as a drying agent for gymnasts, rock climbers, and weightlifters. It is used on the tip of the Pool cues. It can also be made into sticks for writing on chalkboards. Is mostly found in Kent, England it forms the famous white cliffs of Dover

Marble

Marble is a metamorphic rock. It is classified as a metamorphic rock, metamorphic means that the rock has a change in form. Marble forms when limestone is subjected to the heat and pressure of metamorphism. It is composed primarily of the mineral calcite CaCO3. Marble is found in many parts of the world . In the United States. The major marble-producing areas are found in Alabama, Colorado, Montana, Tennessee, Texas, and Vermont. Marble is used for buildings and monuments, interior decoration, table tops, and novelties.

Rocks that are used for everyday life

The rock cycle never ends

Basalt

Basalt may be classified on a chemical and petrographic basis into two main groups, the tholeiitic and the alkali basalts.


Basalt forms when lava reaches the earths surface at a volcano or mid ocean ridge. The lava is between 1100 to 1250 C when it gets to the surface. It cools quickly within a few days or couple weeks forming solid rocks.


Basalt is usually found on the seafloor.


Basalt is used for road base, concrete aggregate, asphalt pavement aggregate, railroad ballast.

The rock cycle