Complete the sentence. The main types of rocks on the earth .
Select one:

are formed early in Earth’s history and cannot change

can change into other types of rocks

can change into water or gases in the atmosphere

can become part of living things but cannot become other rocks

Seed plants that lived during the carboniferous impact life on earth today because a. they are the ancestors of all plant life on earth. b. their remains formed coal, which is an important resource. c. they produced fossils that are used to date many geologic events. d. their presence caused oxygen levels to drop, allowing animals to evolve.

Read the article about the fraser river, one of the most important rivers in canada. what is the most important species of fish in this river? why are the numbers of these fish declining?

Which of the following is the main purpose of using an anchored network of booms which funnel debris to a collection area?