Geo Tectonics EQ.1 Key idea 1.1

Key idea 1.1

Tectonic Hazards can be classified as either seismic or volcanic.

Most earthquakes occur in the pacific ring of fire as well as 75% of active volcanoes are also found in the pacific ring of fire. Key terms:

• Seismic - Relating to the movement of rocks within the earth's crust
• Intra Plate - Occur in the middle of tectonic plates.

Plate Boundaries & Plate movements

Plate movements:

• Divergent/constructive - where two plates move away from each other
• Convergent/Destructive - where two plates are moving towards each other
• Transform/Conservative - where two plates appear to slide alongside each other

Types of crust:

• Continental - less dense, not subducted, oldest rocks on earth
• Oceanic - more dense, but thinner, constantly being subducted and renewed through plate movement

Key terms:

• Convection currents - circular motion and transfer of heat in the mantle as hotter, less dense magma rises, begins to cool and then falls as it becomes more dense.
• Slab Pull - is the portion of motion of a tectonic plate that can be accounted for by its…