Rocks and Roles
- Sedimentary rocks are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate or minerals to precipitate from a solution. examples:Sandstone is sand grains cemented together into solid stone.
- Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (1500 bars), causing profound physical and/or chemical change. example:Quartzite is a coarse-grained metamorphic rock derived from sandstone.
- Igneous rock (derived from the Latin word ignis meaning fire) is one of the three main rocktypes, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. example: Dacite lava is most often light gray, but can be dark gray to black. It is one of the most common rock types associated with enormous Plinian-style eruptions.
- stratification definition. The process by which materials form or are deposited in layers, as in sedimentary rocks and some igneous rocks
Glaciers move, and as they do, they scour the landscape, "carving" out landforms. They also deposit rocky material they have picked up, creating even more features.Glaciers leave their mark on the landscape not only through erosion, but also through deposition. Deposition involves carrying loose materials from one area and leaving, or depositing, these materials in another area. Depositional features are created by the release of rocky material from a glacier.If you know how long a go things happend like a glacure you can see the difference in the rocks when you ding down in them and see how long ago things happend and what happend .the thicker the rock the older it is and if you find a foofle in the rock that is of a dinosorr you know that the rock is really old.
the older rock could be on the top because of weathering tearing away the new rock . Or a tectonic plate could come over another tectonic plate with new rock the the old rock would be closer to the top .
living organishims can change the landscape by the things they do like if we did a hole we changed the landscape . when a coral island is made be a Coral polyps they change the land scape by making an island or coral reef.