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.
A gradual increase in the overall temperature of the earths atmosphere
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
A depression in the Earth's surface in which an ocean lies
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
Coveregent/ destructive Curved chain of volcanic islands located on plate looundiy : Hawaii
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
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 Cuba
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 Good: - 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 China
Similarities & differences between Tribes and modern life
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