Why is the periodic table such a useful tool for chemists

Which agents contribute to erosion? sunlight. shorelines. moving water. ice and glaciers. humans and animals.

Which of the following is true about fossils? a. the relative age of fossils cannot be determined from their position in sedimentary layers. b. fossils found in lower layers of sedimentary rock are as old as fossils found in upper layers of sedimentary rock. c. fossils found in upper layers of sedimentary rock are older than fossils found in lower layers of sedimentary rock. d. fossils found in lower layers of sedimentary rock are older than fossils found in upper layers of sedimentary rock.

Asap! ! ! western china, northern china and southeastern mongolia are all located in what climate zone? tropical wetdesert humid subtropical humid continental