THE RESTLESS EARTH

INSIDE THE EARTH

• Core: the hottest and centre bit of the earth
• Mantle: hot, some rocks are semi molten and flow
• Crusts: thinner outer shell, Made From Solid Rocks
• Plates: slabs of earth, carries continents
• Plate bounderies: where plate meets.

PLATES

• Sliding plates
• Colliding plates
• Seperating plates.

SLIDING PLATES

• This is when plates pass by each other.
• Cause: earthquakes

COLLIDING PLATES

• Currents of molten drag the toward each other
• Causes: (i) earthquakes (ii) fold mountains (iii) ocean trenches

SEPARATING PLATES

• Current molten in mantle drags plate apart
• Causes: (i) volcanic islands (ii) volcanic mountains (iii)mid ocean ridge

EARTHQUAKES

FORMED

• When plates slide or collide they cause compression underneath the earths surface causing a crack
• The crack is know as the focus
• The crack causes shockwaves around the focus
• These cause the earth to tremble or quake.the epic centre is where the strongest effects occure.
• The Seismograph is used to measure earth quakes.

(3) VOLCANIC ACTIVITY

• Plates seperate causeing magma to force its self through the crack onto the surface
• Magma then cools and hardens, which is then known as lava
• When lava is poured quietly it is known as Mid- Ocean- Ridge
• When lava violently forces its way out through a vent its known as Volcanic activity

TYPES OF VOLVANOES

• Active: Erupts regularly EG: Etna, vesuvius Italy
• Dormant: Hasn't erupted in a long time but may erupt EG: Cotopaxi, Ecuador
• Extinct: hasnt erupted in historical times EG: Slemish, Co Antrim, Ireland

THE PACIFIC RING OF FIRE

• This is a ring around the pacific ocean
• WItch active volcanoes