P1- the earth in the universe
- Created by: willbrewin1
- Created on: 19-04-15 11:36
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- P1- the earth in the universe
- the solar system consists of a star (the sun) and things that orbit it in eclipses
- planets reflect light and orbit the sun, there is 8 in our solar system
- closest to the sun are the inner planets, mercury, Venus, earth then mars
- next is the asteroid belt then much further out there is the outer planets jupiter, saturn, uranus then neptune
- closest to the sun are the inner planets, mercury, Venus, earth then mars
- planets reflect light and orbit the sun, there is 8 in our solar system
- the big bang theory
- large dust/gas cloud condensed, then gravity caused cloud to collapse on itself, at centre formed a protostar, temp got so high that fusion started and the sun was born, around the sun heavy elements clumped together becoming planets
- if there is enough mass then expansion could stop- big crunch. depends on how much dark matter there is
- we are in the milky way galaxy, there is 10^11 suns
- the type of EM radiation and the colour of the star can tell us surface temp, whats in sun and lots of other things
- Parallax- uses the apparent movement of a star to work out actual distance to a star
- light pollution and the atmosphere can make light detection difficult
- we see what stars used to look like
- distances are huge and so even though the speed of light is fast we see what the stars used to be like
- RED SHIFT
- when a star is moving away from i=us the wavelength stretches towards the red end of the spectrum and so appears red
- supports the big bang theory
- continental drift- wegner
- peole used to think that there was a land bridge connecting Africa to south ametica, explaining the similar coastline rock and fossil types
- he said that all continents were once joined - pangea, explaining africa and south america
- however he was frowned upon because he wasn't a 'proper' geographer and there was no evidence
- evidence of tectonic plate movement confirmed his theory
- Earths structure
- solid inner core, liquid outer core, liquid mantle and solid crust
- oceanic crust is denser and heavier than continental
- earthquakes produce wave motions
- recorded on seismograph
- time taken and also which seismograph/s are reached shows us strength and wave type
- p-waves: solids and liquids, faster than S-waves and are longitudinal (vibrations in same direction as wave travel)
- s-waves: only go through solids, slower than P-waves, transverse (vibrates at 90 degrees to wave travel)
- recorded on seismograph
- the solar system consists of a star (the sun) and things that orbit it in eclipses
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