What are stromatolites?

eukaryotes with nuclei that were formed by a single cell or many cells during the precambrian time

soft-bodied organisms resembling the types of jellyfish, worms, and coral that live in the oceans today

layered mounds of calcium carbonate that were deposited by algae during the precambrian time

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.

How does the bare soil surface type affect the amount of runoff

All of the following are extrusive landforms except           a. batholiths.   b. lava plateaus.   c. shield volcanoes.   d. geysers.