Terms in this set (...)

A huge cloud of gas that entered our milky-way to form the sun. Made up of dust and gas mostly helium and hydrogen
Outer-core: form Iron and nickly alloy
Inner-core: from Iron, solid 1220 km thick
Conservative plate boundaries,
when two plates shift
The hypothetical landmass that existed when all continents were joined
Sea floor spreading
Occurs at mid-ocean ridges, new oceanic crust is formed through volcanic activity and gradually moves away from the ridge.
The big bang
A leading Explanation about how the universe began. Goldilocks conditions - everything is just right.
Global warming
A gradual increase in the overall temperature of the earths atmosphere
Greenhouse effect
Incoming UV radiation easily passes through the earth's atmosphere. some of it is absorbed, some of it bounces back to space as heat. Greenhouse gases in the atmosphere absorb and rediate some of the heat back to earth -- Global warming
Ozone layer (UV light)
A key element of the earth's atmosphere protecting life on earth form harmful UV light emitted by the sun
Ocean basin
A depression in the Earth's surface in which an ocean lies
Plate tectonics
Eurasian, Australian, Pacific, African, North Americans, Naxca, Antartic, Indian
Ring of Fire
Destructive /Convergent
Volcanos + earthquakes often occur
Surrounding pacific ocean:
Asia, central/south Asia
Island arc
Coveregent/ destructive
Curved chain of volcanic islands located on plate looundiy : Hawaii
Continental drift
When all the tectonic plates separate creating individual continentals
The place where the oceanic plate is pushed under the continent plate.
The gravitational attraction of particles in space that gradually forms larger bodies, including stars and planets
Protoplanetary disk
A disc of gas and dust, often geometrically thin and opaque, orbiting a newly formed star, from which planets may eventually form
The sorting of layers due to heat and gravity within a planet or star, with heavier metals moving towards the core and lighter materials to the surface
Social organisation which advocates that the means of production, distribution and exchange should be owned or regulated by the community as a whole.

Power: Shared
A system of government by one person with absolute power.

Power: Concentrated
North Korea
Good & bad between Tribal vs Agriculture
Bad Agr:
- always the same, (nothing new)
- not prepared to leave when necessary
- Sustainable
- last for a long time
The second outer layer of the earth. made from silicate rocks which are rich in magnesium and iron, mostly solid.

- 2900 km thick
All property is owned by the community and each person contributes and receives according to their ability and needs.

Power: Shared
Similarities & differences between Tribes and modern life
Differences: Nomadic / settled communism / democracy

Similarities: Care for each other. everyone is treated equally
Hot molten or semi - fluid rock erupted from a volcano
Ocean trenches
Convergent / destructive
The oceanic and continental plates collide forcing the denser oceanic plate under forming a trench and volcanos
- The rigid, rocky outer layer of the earth
- Brocken down in other blocks called plate tectonics
- Consists of the crust and the solid outermost layer of the upper mantle
The mixture of gases surrounding the earth
A system where the country is ruled by a monarch (Queen/king)
Absolute: complete power by Monarch
Constitutional: power of the monarch is restrained by a parliament, by law or custom

Constitutional Power: In between Belgium
Absolute Power: Concentrated Saudi Arabia
A system of government in which people choose their rulers by voting for them in elections

Power: In between
How did we move to agricultural society?
- Accidental theory
- change in Climate
- Ecological theory
- Social competition
- Economic factors
- Population pressure
Conservative plate
Plates slide past each other in opposite directions or in the same direction but different speeds + sudden movement = earthquake
The country's trade and industry are controlled by private owners for profit, rather the by the state.

Power: In between - Concentrated
Mid-ocean ridges
Divergent / constructive
Oceanic plates separating, magma comes up creating new land.
Fold mountains / collision boundary
Convergent / destructive
Two continental plates push up forming mountains
- Alps
Divergent / constructive
When two plates pull away or drift apart from each other

= sea floor spreading (rift valleys, mid - ocean ridges)
Convection (mantle)
The transfer of heat by movement of materials within the mantle.
Convergent / distructive
When two plates push together forming oceanic trenches, volcanoes, mountains
Outcomes of a democratic revolution
Still face several problems
Socially : could not deal with total freedom - needed guidance
Economic: debts. Country will have to pay. change lifestyle (free market)
Politically: Democratic but need someone to be in control and guide the country. They do not know how to deal with it

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