it forms when two plates collide.
The denser plate sinking below the more buoyant plate
Deep ocean trenches are created when oceanic and continental plates collide.
Real World Event/Disaster
in occurred on 26 January 1700 Juan de Fuca oceanic plate is subducting beneath the westward moving North American continental plate. The Cascade Mountain Range is a line of volcanoes above the melting oceanic plate.
they are separating and going the opposite direction
they create an Mid-ocean ridge on the ocean floor
rifts valley on continents
Real World Event/Disasters
A strong earthquake rattled East Africa on December 5, 2005. Measuring 6.8 on the Richter scale, the earthquake was centered under Lake Tanganyika, the oldest and deepest of the Rift Valley lakes, and was felt as far away as Nairobi, the capital of Kenya some 975 kilometers (600 miles) from the epicenter.
they slide horizontally past each other.
sometimes when the tectonic plates slide past each other
they get stuck and stress builds up
giant earthquake will strike California this summer. Skyscrapers will topple, the Hoover Dam will crumble and a massive tsunami will wash across the Golden Gate Bridge