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Ch 6: The Rock and Fossil Record

Across
________ are shelters made by animals, such as clams, that dig into sediment. (103)
A _______ is an impression, or print, left in sediment where a plant or animal was buried. (103)
Hardened tree sap is called ______. (101)
As you can see, the largest division of geologic time are the ______. (108)
The _________ era lasted from about 542 million to 251 million years ago. (110)
A ______ is the trace or remains of an organism that lived long ago. (101)
Scientists divide the eras into _____, which are the third- largest division of the time scale. (108)
Other fossils are simply signs, such as footprints, that an organism was alive. These fossils are called ______ fossils. (101)
Other fossils are simply signs, such as footprints, that an organism once existed. The study of fossils and ancient life is called __________. (89)
James _______ was one of the scientists who first realized that geologic changes can happen very slowly. (87)
The theory that the Earth’s features form only because of small changes over long periods of time is called __________. (88)
__________ study fossils of ancient plants. (89)
Some fossils are made from parts of an organism’s body. These fossils are called ______ fossils. (101)
The geologic time scale includes all of the Earth’s 4.6 ______ years of history. (108)
The ___________ eon is the most recent eon in the Earth’s history. (109)
Scientists have used fossils to learn some of the _______ of life on Earth. (104)
Geologists have combined information from rocks and fossils to produce a timeline of the Earth’s history. This timeline is called the ________ time scale. (107)
_________ is the death of every member of a species. (109)
Fossils can show evidence of climate _______. (104)
Down
________ dating methods can’t tell scientists the exact age of a fossil. (105)
However, in the early 1800s, a scientist named Charles ______ reintroduced the idea of uniformitarianism. (88)
Periods are divided into ______, which are the fourth-largest divisions of the time scale. (108)
A _______ is an example of a trace fossil. (102)
_________, or preserved animal dung, are another example of trace fossils. (103)
The belief that Earth changes only because of sudden events is called ________. (87)
During _________, minerals replace all or part of an organism’s tissues. (102)
The _________ era began about 65 million years ago and continues to the present. (111)
Scientists who study paleontology are called ____________. (89)
The ________ era began about 251 million years ago and ended about 65 million years ago. (110)
To understand how life on Earth has changed, scientists _______ fossils. (104)
A _______ is any evidence of past life. (89)
______ fossils are fossils of organisms that lived during a relatively short period of time. (105)
Scientists divide the Phanerozoic eon into three _____, which are the second largest divisions of the time scale. (108)
A ______ is an object that forms when sediment fills a mold and becomes rock. (103)