Global climate change, tectonic activity, asteroid impacts, and large volcanic eruptions are all factors that have led to in the fossil record.

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 not a reason why shenzhen, china, is considered an emerging global city

What do you call fast flowing water that goes over rocks