Show:
C
See
Sea
To
Two
100
cloud of gas and dust that formed the solar system
What is solar nebula
100
the thin and solid outermost layer of the earth
What is the crust
100
_________caused early organisms to live underwater
What is ultraviolet radiation
100
this is the spin of a body on its axis
What is rotation
100
one complete trip along an orbit is called what
What is revolution
200
is a measure of the average kinetic energy on particles in an object
What is temperature
200
what are gas giants made of
What is helium and hydrogen
200
by 4 billion years ago there was a global __________ covering the planet
What is ocean
200
the path a body follows as it revolves around and object is called _____
What is orbit
200
who continued Brahe's work after he died?
What is kepler
300
_______is the thin and solid layer of the earth
What is the crust
300
which are bigger gas giants or rocky planets
What is gas giants
300
the molten rock on the earth released large amounts of_____________and___________
What is carbon dioxide and water vapor
300
similar to the poles of a magnet _______ repels each other
What is positively charged atoms
300
how long did brahe observe the planets?
What is more than 25 years
400
Today the earths atmosphere is 78%________
What is nitrogen
400
when the sun formed what happend to the remaining gas and dust
What is it was blown out of the solar system
400
the shape of the earth when it was young
What is potato like
400
why doesn't moon come crashing into earth because of gravity?
What is inertia
400
at first some type of _____ ______ was thought to be the source of sun's energy.
What is burning fuel
500
True or false nebulas are normally dark and invisible to optical telescopes
What is true
500
are small planets
What is planetesimals
500
the layer of rock between the crust and core
What is mantle
500
how long would the sun last if all of its gravitational energy was released?
What is 45 million years
500
tiny amounts of ______ can produce huge amounts of energy
What is matter