Examples of regional metamorphic rocks include schist and gneiss. Thermal metamorphic rocks, also known as contact metamorphic rocks, are formed by extreme heat along with quite a bit of pressure. The pressure pushes the molten rock against the Earth's surface, causing it to recrystallize. Examples of thermal metamorphic rocks are marble and sandstone
Each boundary between 2 plates have the capability of being a different type of boundary. The 3 types of boundaries are destructive (plate being destroy as another passes over the top), constructive plates moving apart from each other creating new crust) and conservative (sliding past one another). Each boundary will have its own key characteristics. Firstly, we will look at destructive plate boundaries. These are boundaries where the plats move towards each other but 1 plate travels underneath (subduction).
There are divergent boundaries where the plates are moving away from each other and new land is formed as magma is released from inside the mantle. There are convergent boundaries where the plates are moving toward each other. At convergent boundaries mountains or trenches can form. The last type of boundary is a transform boundary where the plates move past each other and can cause an earthquake
Sedimentary Rocks The Beginning Sedimentary rocks are some of the foundations of the earth. They range from rock salt, to gypsum, slate, sandstone, limestone, and even coal. The grains of these rocks range from a coarse grain like cement, to very fine that only a microscope can see the grain. Where do these rocks come from? How are these sedimentary rocks formed?
GCSE Geography Explain the process which leads to the development of one landform at a destructive plate boundary (6 marks). A destructive plate margin is an area where two plates are moving towards each other. The point where the two plates meet is called the subduction zone, where one plate is forced down under the other into the mantle. The subducted plate is cooler and denser than the surrounding mantle and gravity pulls it down. Along the coast of south America, the Nazca plate is moving towards the south American plate.
Earthquakes are caused by the rift and abrupt movement of two rocks that suddenly slip past one another. Earthquakes occur along faults which are fractures in the lithosphere where sections of rock move past one another. There are three important parts to an earthquake: the focus, the epicenter, and seismic waves. The focus is the point on the fault where the separation occurs and from where the seismic waves are formed. The epicenter is located directly above the focus on the earth’s surface.
Cody Walters 11/29/1010 Math 144 Earthquake Intensity and the Richter Scale Earthquakes occur due to the activity of forces, energy, stored deep within the Earth's interior. These forces are constantly affecting the surface of the Earth, forming mountains, valleys, ridges etc. When the energy stored within the Earth is suddenly released, for example by shearing movements along faults in the crust of the Earth, an earthquake results. The area of the fault where the sudden rupture takes place is called the focus point or hypocenter. The point on the Earth's surface directly above the hypocenter is called the epicenter of the earthquake.
The plates meet with each other, and if rough spots cause the movement to stop at the edges, the motion of the plates continue. When the rough spots can no longer hold, the sudden release of the built-up motion releases, and the sudden movement under the sea floor causes a submarine earthquake. This area of slippage both horizontally and vertically is called the epicenter, and has the highest magnitude, and causes the greatest damage. As with a continental earthquake the severity of the damage is not often caused by the earthquake at the rift zone, but rather by
Wegener's theory also provided an alternate explanation for the formation of mountains (orogenesis). The theory being discussed during his time was the "Contraction theory" which suggested that the planet was once a molten ball and in the process of cooling the surface cracked and folded up on itself. The big problem with this idea was that all mountain ranges should be approximately the same age, and this was known not to be true. Wegener's explanation was that as the continents moved, the leading edge of the continent would encounter resistance and thus compress and fold upwards forming mountains near the leading edges of the drifting continents. The Sierra Nevada Mountains on the Pacific coast of North America and the Andes on the coast of South America were cited.
J. Subbiondo © 2004The CrustThe outer layer of the Earth is called the crust. It is made up of rock that floated to the surface when the Earth was formed. It is not a continuous layer, but is made up of large masses called tectonic plates.These plates drift slowly across the Earth's surface (tectonic means moving).The movement of these plates creates mountains and valleys.At weak points in the crust, it causes volcanic eruptions. And when plates bump into each other, earthquakes occur -- emitting shock waves or vibrations called seismic waves. The crust is the Earth's coldest layer.