planetary geology

Question 1

meteorites?

Answer 1

fragments of rock which fall to earth

Question 2

asteroids?

Answer 2

rocky objects which failed to form a planet

Question 3

comet

Answer 3

composed of ice and dust, outer layer melts into water vapour as it nears the sun

Question 4

planet

Answer 4

sizable object orbiting a star

Question 5

moon

Answer 5

natural satellite orbiting a planet

Question 6

sun

Answer 6

star composed of H and He. 99.8% of total mass of solar system

Question 7

solar system

Answer 7

consists of the terrestrial (rocky) planets and the gas giantsr

Question 8

age of Earth

Answer 8

4,550,000,000

Question 9

stage A of solar system formation

Answer 9

roughly spherical nebula begins to contract

Question 10

stage B of solar system formation

Answer 10

a flat rapidly rotating disc forms with matter concentrated at the centre

Question 11

stage C of solar system formation

Answer 11

concentration continues, proto sun is formed and rings of material are left behind

Question 12

stage D of solar system formation

Answer 12

ring material condenses into planets revolving in orbit around the sun