Answer:
Astronomical Unit (AU). The definition of AU is the distance between the sun and the earth. Hopes this helps!
Explanation:
Rain forest: most; tundra: least
Just like sedimentary rocks, metamorphic rocks can be forced to the Earth's surface too. ... All this movement can cause rocks that were once underground to be brought up to the Earth's surface. This process is called uplift. Once exposed to the elements the rock on the Earth's surface begins to weather and erode.