The core!
There are two things that cause it which are the earths orbit and thetilt of the earths axis.
Meteor. Meteorites are the ones that do hit Earth.
The Earths Inclination A+
Earth's climates might be different because they won't be the same
The season
According to NASA, Saturn has a volume 763.5 times the volume of the Earth. So, by volume, some 763 and a half Earths could fit into Saturn. (Saturn is the least dense major planet, and has a mass only 95.2 times that of the Earth.)
Mercury's volume is equivalent to 0.056 x Earths Venus' volume = 0.857 x Earths (Earth) volume = 1 x Earths Mars' volume = 0.151 x Earths Jupiter's volume = 1321.3 x Earths Saturn's volume = 763.59 x Earths Uranus' volume = 63.086 x Earths Neptune's volume = 57.74 x Earths
Mercury (smallest), Mars, Venus, Earth, Neptune, Uranus, Saturn and Jupiter (largest). Note that although Neptune has more mass than Uranus, it is smaller in size. Mercury's volume = 0.056 x Earths Mars' volume = 0.151 x Earths Venus' volume = 0.857 x Earths (Earth) volume = 1 x Earths Neptune's volume = 57.74 x Earths Uranus' volume = 63.086 x Earths Saturn's volume = 763.59 x Earths Jupiter's volume = 1321.3 x Earths
Most of earth's volume has been scientifically proved to be in the earth's mantle.
Roughly 1,000,000,000,000 cubic kilometers.
The Earths crust.
Saturn's volume is equal to that of 763.59 Earths.
Mercury's volume = 0.056 x Earths (6.08x1010 km3) Venus' volume = 0.857 x Earths (9.38x1011 km3) (Earth) volume = 1 x Earths (1.08x1012 km3) Mars' volume = 0.151 x Earths (1.63x1011 km3) Jupiter's volume = 1321.3 x Earths (1.43x1015 km3) Saturn's volume = 763.59 x Earths (8.2713x1014 km3) Uranus' volume = 63.086 x Earths (6.833x1013 km3) Neptune's volume = 57.74 x Earths (6.254x1013 km3)
In terms of Radius and diameter; Mercury's radius and diameter (at the equator) = 0.3825 x that of Earths (or 38.25%) Venus's radius and diameter = 0.9488 x Earths (nearly 95%) (Earth's radius = 6378km, diameter = 12756km) Mars = 0.5323 x Earths (53.2%) Jupiter = 11.21 x Earths Saturn = 9.45 x Earths Uranus = 4.01 x Earths Neptune = 3.88 x Earths In terms of Volume; Mercury's volume = 0.056 x Earths (or 5.6% of Earths) Venus' volume = 0.857 x Earths (85.7%) (Earths volume = 1.08 x 1012 cubic km (km3)) Mars' volume = 0.151 x Earths (15.1%) Jupiter's volume = 1321.3 x Earths Saturn's volume = 763.59 x Earths Uranus' volume = 63.086 x Earths Neptune's volume = 57.74 x Earths
The earth can fit into the sun 1,304,000 times in volume.
Mercury's mass = 0.055 x Earths, Volume = 0.056 x Earths Mars' mass = 0.1075 x Earths, Volume = 0.151 x Earths Venus' mass = 0.815 x Earths, Volume = 0.857 x Earths (Earth) mass = 1 x Earths, Volume = 1 x Earths Uranus' mass = 14.536 x Earths, Volume = 63.086 x Earths Neptune's mass = 17.147 x Earths, Volume = 57.74 x Earths Saturn's mass = 95.152 x Earths, Volume = 763.59 x Earths Jupiter's mass = 317.8 x Earths, Volume = 1321.3 x Earths
most earths volume is contained in the mantle.