It takes 687 days for Mars to orbit the Sun, which is 1.88 Earth years. 1.88 x 1.88 = 3.5378 which has a cube root of 1.5237 meaning that on average Mars is 1.5237 times the Earth's average distance from the Sun.
boulder definition: The definition of a boulder is a large, smooth rock. (noun) When you build a retaining wall and use a large rock in the wall, this rock is an example of a boulder. A rock that has been detached from the earth by erosion or for ot...
Definition of gravel. 1  1 obsolete : sand. 2  2a : loose rounded fragments of rockb : a stratum or deposit of gravel; also : a surface covered with gravel a gravel road. 3  3 : small calculi in the kidneys and urinary bladder.