8893820
Description
| Question | Answer |
| The solar system | There are 8 planets 4 inner and 4 outer separated by the asteroid belt Stars are bigger and output light and planets only reflect the light The solar system is about 5 billion years old Asteroids and comets have elliptical orbits but comets have ice so melt as they get closer to the sun forming an ion tail |
| Beyond the solar system | We are in the milky way galaxy which is a spiral galaxy that has 10(11) stars The universe has many galaxies distance is usually measured in light years which measures the speed of light (300000km/s) |
| Looking into space | We can tell the temperature of a star by the em waves given off Parallax can be used for close stars (trig with the movement of the planet) The atmosphere can refract the incoming light from space and light from earth can pollute it |
| The universe | Red shift tells us galaxies are moving away from us and the further they are the faster they move Big Bang says the universe started with an explosion about 14 bill years ago from a single point We do not know how the universe will end |
| Changing earth | Rocks can be used as markers of what happened in that time like ash This shows us the earth is 4 bill years old Rocks are constantly weathered and turned to sedimentary rock |
| Continental drift | Fossils found on different continents were said to be because of land bridges puzzle piece land Wegner said that the continents moved and were once a supercontinent but could not explain it evidence of rock from constructive bounds was found as proof |
| structure of the earth | Crust - thin silicon based and continental or oceanic plates that interlock Mantle - semi-liquid and made of rock causing convection currents core - made of nickel and iron and heats the earth from radio active decay the inner core is solid and outer is liquid |
| Seismic waves | S-waves and P-waves can be produced from earthquakes S-waves can only travel through solids which shows there is a liquid part to the core as of a shadow Curve with increasing depth Seismographs measures them from across the earth |
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