plate boundaries😺🥀🙏

plate boundaries

place where 2 diff tectonic plates meet is called plate boundary.

type of plate

Types of Plates: Oceanic and Continental

•Oceanic plates lie primarily under the ocean.

• Continental plates contain continents. 

Divergent plates boundary

• 2 plates are moving apart.

• This often occurs in the middle of the ocean

Divergent plates boundary

When this plate boundary happen on land, it make a rift valley as the plates pull apart

hum:

DB = create rift valleys + volcanic eruptions

• movement of DB can also create weak earthquake

Convergent plate boundaries - volcano

• 2 plates = moving towards each other.

• If oceanic crust collides w 0 continental crust:

• oceanic crust = denser + is subducted into the mantle + melt

• The melted material mix w volatile gases, which force it to the surface + make some of the most explosive volcanoes.

Subduction➡️ Volcanoes

• when plate sink into mantle - it melt to make magma -

• The pressure of magma build up under Earth’s surface

• The magma escape thru weaknesses in the rock and rise up(volcano)

Convergent boundaries: Continental - earthquale

• 2 continental plate can move toward each other (aka collision boundary)

• if 2 plate get stuck on each other - pressure can build up. When plate snap past each other ➡cause powerful earthquake

HUM:

When C + C plate colide - both r similar density - neither plate will subduct - instead land crumples + folds creating mountain ranges - process = can also create deep valleys

• No volcanic activity

Convergent boundaries: Oceanic

•Ocean verses Ocean: the denser plate will subduct under the plate that is less dense, creating deep-sea trench at the point of subduction.

• Ocean vs continental: Oceanic plate ( bc it denser) = sink benath continetal plate - calld subduction - as OP sink - melt + rise to surface creating volcanic eruption

• Responsible for 80% of world earthquake

Transform boundaries - earthwuakes

• plates slide past each other

• ❌ volcanoes but earthquake = be very destructive - plate get stuck as they slide past each other + pressure builds up + when plate snap energy = released + earthquake happen