Rocks and Roles

Define sedimentary: that has formed from sediment deposited by water or air.

Define metamorphic: denoting rock that has undergone transformation by heat, pressure, or other natural agencies, e.g., in the folding of strata or the nearby intrusion of igneous rocks.

Define igneous: having solidified from lava or magma relating to or involving volcanic processes.

Example of igneous rock: intrusive igneous rocks such as cordite, gabbro, granite and phlegmatic that solidify below Earth's surface.

Example of sedimentary: clastic sedimentary rocks such as breccia, conglomerate, sandstone and shale, that are formed from mechanical weathering debris

Example of metamorphic: foliated metamorphic rocks such as gneiss, phyllite, schist and slate which have a layered or banded appearance that is produced by exposure to heat and directed pressure

Define stratification: Stratification is a system or formation of layers, classes, or categories.Stratification is used to describe a particular way of arranging seeds while planting, as well as the geological layers of rocks.

The more opaque the layer is the older it is. We can also determine age through fossils. If you find a fossil within a layer of sediment along with volcanic ash then you ccan connect that the fossil and the volcanic eruption (the ash making up most of the layer of rock) are from the same time period.

If the amount of seismic activity increases then, the younger layers of the earth may be under the older layers because, the breaking of the layer may cause pieces to shift.

most limestones form in shallow, calm, warm marine waters, attaching onto the previous landform.

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