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fossils that are tracks and evidence of animal activity
trace fossils
fossils that form when minerals replace all or part of an organism
petrified fossils
fossils that formed when hard parts of the organism are buried in sediment
molds
minerals that fill the empty molds
cast fossils
the actual organism preserved in amber, ice, tar
preserved remains
massive irregular shaped rocks which form the land and Earth and bottom of oceans
tectonic plates
a volcano type that is cone shaped, steep sided, thick lava, also called stratovolcano
composite
type of volcano that is small, highly explosive
cinder cone
wide volcano with lava that flows easily
shield
populations that live together in a defined area
community
study of interactions between organisms and the environment
ecology
a single individual living thing
organism
groups of organisms of one type, living in the same area
population
community and its nonliving surroundings
ecosystem
part of the earth that contains all ecosystems
biosphere
a system of many food chains that interact with each other
food web
