The Rock and Fossil Record Crossword Puzzle

QUESTIONS LIST:

• change : fossils can show evidence of climate _ .
• amber : hardened tree sap is called _ .
• phanerozoic : the _ eon is the most recent eon in the earth's history.
• history : scientists have used fossils to learn some of the _ of life on earth.
• billion : the geologic time scale includes all of the earth's 4.6 _ years of history.
• mold : a _ is an impression, or print, left in sediment where a plant or animal was buried.
• relative : _ dating methods can't tell scientists the exact age of a fossil.
• paleozoic : the _ era lasted from about 542 million to 251 million years ago.
• petrifaction : during _ , minerals replace all or part of an organism's tissues.
• lyell : however, in the early 1800s, a scientist named charles _ reintroduced the idea of uniformitarianism.
• catastrophism : the belief that earth changes only because of sudden events is called _ .
• eons : as you can see, the largest division of geologic time are the _ .
• periods : scientists divide the eras into _ , which are the third- largest division of the time scale.
• body : some fossils are made from parts of an organism's body. these fossils are called _ fossils.
• epochs : periods are divided into _ , which are the fourth-largest divisions of the time scale.
• extinction : _ is the death of every member of a species.
• paleontology : other fossils are simply signs, such as footprints, that an organism once existed. the study of fossils and ancient life is called _ .
• hutton : james _ was one of the scientists who first realized that geologic changes can happen very slowly.
• burrows : _ are shelters made by animals, such as clams, that dig into sediment.
• fossil : a _ is the trace or remains of an organism that lived long ago.
• geologic : geologists have combined information from rocks and fossils to produce a timeline of the earth's history. this timeline is called the _ time scale.
• trace : other fossils are simply signs, such as footprints, that an organism was alive. these fossils are called _ fossils.
• footprint : a _ is an example of a trace fossil.
• coprolites : _ , or preserved animal dung, are another example of trace fossils.