1. What happens when matter changes state? a. Its chemical properties change.
b. Its physical properties change.
c. The energy of its particles remains the same.
d. two of the above
ne.

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