Read these sentences from the article. "Individual layers of ancient sediment form horizontal stripes on the rock. From a few steps back, the rock wall looks like a cross-section of a giant, stone encyclopedia." Why might the author have included this description of the rock wall?

- decrease the number of plants and animals living in the water.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

fe 55.85 g/mol and h2o 18.02 g/mol.