Which of the following is an example of chemical weathering?
water breaking rocks
plant roots splitting rocks
acid dissolving limestone
wind breaking down rock

Me the formula cacl2 represents the compound

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.