Natural Hazards

Difference between oceanic and continental crust

Oceanic crust is thinner more dense and found beneath oceans.Continental curst is thicker, less dense and found under landmasses.

What is hotspot and how does it happen?

A hotspot is where magma rises from breaks in tectonic plates

How do we measure and how does Earthquakes happen?

Earthquakes happen when rocks underground suddenly break along a fault, releasing energy that shakes the ground. This ussually occurrs because eof pressure building up

Examples if natural Hazards?

Earthquakes, Tsunamis, and volcanoes.

Why do people live in danger zones?

Because os fertile land, job opportunities or cant afford to move out. To prevent it we can use warning system.

Explain what PPP means?

PPP stands for prepare protect and prevent

3 categories of Volcanoes and difference?

Shield volcano is runny lava, wide and gentle slopes. Composite is steep, explosive lava while Cindercone is small and steep.

What is the Christchurch Case?

In 2011 an earthquake killed 185 people and cause major damage. Fast emergency response.

3 types of plate boundaries?

Constructive, destructive, conservative.

Identify the 4 Spheres of the earth?

Atmosphere-layer of gasses

Hydrosphere-layer of water

Biosphere-layer of earths crust

Geoshpere-rosck of the earth’s crust

Super continent and 5 tectonic plates?

Pangea combined all of the Earths landmasses. African plate and Pacific plate

Hazards risk and what makes ppl vulnerbale to them?

The chance of being affected by a natural hazard. Densely populated areas or slow system response.

Convection currents

The circular movements of molten rock in earths mantle caused by heating and cooling of material.

Natural hazards

An extreme event that potentially causes harm to humans. Tectonic, climatic and geo morphological hazards