Ümberkujunduvad

Ümberkujunduvad, also known as metamorphic rocks, are a type of rock that has been transformed from its original form through intense heat, pressure, and chemical processes. This transformation occurs due to the effects of metamorphism, which is the change in mineralogy and texture of rocks without the rock melting into liquid magma. Metamorphic rocks are formed from pre-existing rocks, known as protoliths, which can be igneous, sedimentary, or even other metamorphic rocks.

The process of metamorphism can occur at various depths within the Earth's crust, ranging from a few kilometers to several tens of kilometers. The intense heat and pressure cause the minerals in the protolith to recrystallize, forming new minerals that are stable under the new conditions. This can result in significant changes in the rock's texture, such as the development of foliation, which is a planar arrangement of minerals.

Metamorphic rocks are classified based on their protolith and the metamorphic grade, which is a measure of the intensity of metamorphism. Common types of metamorphic rocks include gneiss, schist, marble, and quartzite. Each of these rocks has distinct characteristics and is formed under specific conditions.

Metamorphic rocks play a crucial role in the Earth's geological processes. They are often found in mountain ranges and are associated with tectonic activity. The study of metamorphic rocks provides valuable insights into the Earth's history, including the conditions and processes that have shaped our planet over millions of years.