Earth's Crust
The last layer of the Earth and the most visible and tangible layer is the crust. The crust is believed to have been formed almost 200 million years after the planet itself took shape. (Choi, 2014). The Earth’s crust is the thinnest and outermost of the five layers. The Earth’s crust floats above the mantle layer, which lays above the core. The floating aspect of the crust upon the lithosphere causes shifts in tectonic plates and as we have found results in things like earthquakes and also allows for the formation of mountain ranges (Choi, 2014).
Within the crust there are oceans and continents, both filled with life form. Scientists have only proven life form upon this layer of the Earth, it is believed that deeper into the Earth the temperature is far too hot to sustain any life form. “The boundary between the crust and mantle is called the Mohorovicic discontinuity (or Moho)” (Robertson, 2011, para 5). Scientists have not physically seen this boundary they have only used seismic waves to determine its placement. The Earth’s crust is made of mostly rocks of various types; igneous, metamorphic, and sedimentary.
There are two types of crust that compose the outer layer of Earth, the oceanic crust and the continental crust (National Geographic Kids, 2015).
Within the crust there are oceans and continents, both filled with life form. Scientists have only proven life form upon this layer of the Earth, it is believed that deeper into the Earth the temperature is far too hot to sustain any life form. “The boundary between the crust and mantle is called the Mohorovicic discontinuity (or Moho)” (Robertson, 2011, para 5). Scientists have not physically seen this boundary they have only used seismic waves to determine its placement. The Earth’s crust is made of mostly rocks of various types; igneous, metamorphic, and sedimentary.
There are two types of crust that compose the outer layer of Earth, the oceanic crust and the continental crust (National Geographic Kids, 2015).