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5th gr fossils & era

review for test

What are the remains or prints of a dead organism that is usually found in rock layers? fossils
What is a fossil that is a hollow space in rock left by a dead organism? mold
What is a fossil that has the same shape as the original organism? cast
what is a fossil that shows an animal's activity? trace fossil
what is the unchanged remains of an organism or part of an organism called? true form fossils
what is a fossil that helps scientists date rock layers? index fossil
What are tiny bits of matter that settle in water called? sediment
What is rock that forms from the deposit of sediment, usually found in layers, called? sedimentary rock
Where would you find older rock layers -- at the top or the bottom? at the bottom
what type of rock are most fossils found in? sedimentary rock
what do index fossils give us clues to? changes in earth's climate and surface, and the age of rock layers
how old do scientists believe the earth is? 4.6 billion years
what are the four eras of earth's history? Precambrian, paleozoic, mesozoic, and cenozoic
in what era are fossils hard to find? precambrian era
In what era did the formation of the earth begin? precambrian era
which era is the longest? precambrian era
what era is known as "the age of ancient life"? paleozoic era
what era did trilobites live in? paleozoic era
when did the first air breathing animals appear? paleozoic era
Which era is known as "the age of the dinosaurs"? mesozoic era
when did we see the first small mammals? mesozoic era
when did the dinosaurs die out? mesozoic era
what era are we currently in? cenozoic era
when did humans appear? cenozoic era
what era experienced ice ages? cenozoic era
Created by: cariherbst