Flashcards
A2 Geography Hazards Key Terms
Cards in this deck (13)
- 1CoreDensest part of the planet, made of rocks rich in nickel and iron. Outer part is semi-molten and the inner core is solid. Temperature can reach over 6000 dC.
- 2MantleMade of rocks rich in iron and magnesium. High temperatures (5000 dC) within the mantle generate convection currents. Inner mantle is semi-molten (asthenosphere) and the outer mantle is rigid (lithosphere).
- 3CrustLeast dense rocks, rich in oxygen, aluminium and sodium. Varies in thickness across the globe (Oceanic: 6-10km, Continental: up to 70km).
- 4LithosphereThe crust and upper part of the mantle. Rigid. 80-90km thick.
- 5AsthenosphereLower part of the mantle, semi-molten.
- 6SubductionWhen a denser plate is forced under the less dense plate.
- 7Benioff ZoneWhen rock descends further down and the friction and heat causes the oceanic plate to melt. It is where the plate starts to melt away.
- 8IgneousFormed from magma, can be shiny or have tiny holes.
- 9MetamorphicHeat and pressure cause layers and crystals to form.
- 10SedimentarySediment accumulates in layers, and over time forms rock.
- 11Seismic WavesThese are waves of energy that radiate from the focus through the crust.
- 12MagnitudeThe size and strength of an earthquake.
- 13SeismographProduced by a seismometer to show the strength of an earthquake.
Information
- Description
- A2 Geography (Physical Geography - Hazards) Flashcards on A2 Geography Hazards Key Terms, created by Frances McNab on 10/11/2015.
- Created by
- Frances McNab
- Views
- 0
- Rating