Question | Answer |
all things are moving away from each other | the big bang |
theory that planets grow out of rings of gas, dust, and ice surrounding a new born star | nebula theory of planetary formation |
tiny sold pieces of rock and metal that collect in a planetary nebula and eventually accumulate to form a planet | planetesimal |
a celestial body that orbits the sun, has sufficient mass for its self-gravity, and has cleared the neighborhood around its orbit | planet |
4 inner planets with iron cores and a silicate mantle | terrestrial planet |
4 outer planets that mostly consist of hydrogen and helium | jovian planet |
a celestial body that orbits the sun, has sufficient mass for its self-gravity, and has not cleared the neighborhood around its orbit. ex) pluto | dwarf planet |
earths age? | approximately 4.6 billion years |
used isotopes of iron meteorites to give the first accurate age of the earth | claire patterson |
the sinking of elements such as iron and nickel into the earths center | segregation of elements |
rock that makes up the outermost layer of the earth | crust |
thick layer of rock below the earths crust and above the core | mantle |
section of the core, between 2900 and 5150 km deep, that consists of liquid iron alloy | outer core |
inner section of the core and consisting of solid iron and nickel alloy | inner cor |
relatively rigid, non-flowable, outer thick layer of the earth, constituting the crust and the top of the mantle | lithosphere |
layer of the mantle that lies between 100–150 km and 350 km deep; this layer is relatively soft and can move when acted on by force. Boundary between the lithosphere and the mantle | asthenosphere |