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science chpt. 10.

what is a sedimentary rock? is the type of rock that is made of harden sediment.
what is mold? is the hollow area in a sediment in the shape of an organism or a part of a organism.
what is cast? is a solid copy of the shape of an organism.
what are a petrified fossils? are fossils on which minerals replace all or part of an organism.
what is a carbon film? an extremely thin coating of carbon on rock.
what are trace fossils? provide evidence of the activities of ancient organisms.
who is a paleontologist? collect fossils from sedimentary rocks all over the world.
what is a scientific theory? is a well-tested concept that explains a wide range of observations.
what is Evolution? is the gradual change in living things over long periods of time.
what is a relative age? of a rock is its age compared to the ages of other rocks.
what is a absolute age? of a rock is the number of years since the rock formed.
what is the law of superposition? to determine the relative ages of sedimentary rock layers.
what intrusion? the magma cools and hardens into a mass of igneous rock.
what is a unconformity? the surface where new rock layers meet a much older rock surface beneath them.
what is a index fossil? Fossils of widely distributed organisms that lived during only one short period.
what is a atom? all the matter you see, including rocks, is made of tiny particles.
what is an element? when all the atoms in a particular type of matter are the same.
what is a radioactive decay? over time, these elements break down, or decay, by releasing particles and energy in a process.
what is half life? the time it takes for half of the atoms of a radioactive element to decay.
what is a geologic time scale? is a record of the life forms and events in Earth´s history.
what is a era? geologists divide the time between Precambrian Time and the present into three long unites of time.
what are periods? Eras are subdivided into unites of geologic time.
what is a comet? is a ball of dust and ice that orbits around the sun.
what is a continental drift? scientists have found that the continents move very slowly over Earth´s surface because of forces inside Earth.
what are invertebrates? Many were animals without backbones.
what is a vertebrate? is an animal with a backbone.
what is a amphibian? is an animal that lives part of its life on land and of its life in water.
what are reptiles? have scaly skin and lay eggs with tough leathery shells.
what is a mass extinction? in which many types of living things became extinct at the same time.
what is a mammal? is a warm-blooded vertebrate that feeds its young milk.
Created by: lb0911