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=Dynamic Earth = __**Convergent Boundaries**__ Where plates colide, the crust crumples and buckles into mountain ranges, Convergent boundaries where a plate of ocean dives in a process called subduction under a landmass.As the overlying plates lifts up, it also forms mountain ranges. Also the diving plate melts and often erupts out in volcanic eruptions such as those that formed some of the mountains in the San Andes of South America. __**Divergent Boundries**__ At divergent boundaries in the ocean, magma from deep in the earths mantle rises toward the surface and push's apart two or more plates. A single mid-ocean ridge system connects the worlds oceans, making the ridge the longest mountain range in the world. Where plates serving landmasses collide, the crust crumples and buckles into mountain ranges. The San Andreas Fault in California is an example of a transform boundary where two plates grind past each other along what are called strike-slip faults. These boundaries don't form features like mountains or oceans, but the halting motion often triggers large earthquakes.
 * __Transform Boundaries__**



__**Mid Ocean Ridge**__ A mid ocean ridge or mid oceanic ridge is an under water mountain range formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma. Beneath a typical mid-ocean ridge, mantle material partially melts as it rises in response to reduced pressure the global mid-ocean ridge system is the largest single volcanic feature on the earth. The mid-ocean ridge consists of thousands of individual volcanoes or volcanic ridge segments which periodically erupt.

About 1,900 volcanoes on earth are considered active meaning they show some level of activity and are likely to explode again. Volcanoes text to exist along the edges between tectonic plates, massive rock slabs that make up earths surface. When thick magma and large amounts of gas build up under the surface eruptions can be explosive, exspelling lava, rocks and ash into the air. A large eruption can be very dangorous for people living around it. The lava can reach up to 2,000 degree's F.
 * __Volcanoes__**

__**Earthquakes**__ 80% of all the planet's earthquakes occur along the rim of the pacific called "The Ring of Fire" because of the volcanic there as well. Most earthquakes occur at faults zone, where tectonic plates-giant rock slabs that make up the earths upper layer collide or slide against each other. Other quakes can occur far from faults zone when plates are squeezed.