Generally, only the ________________ parts of organisms become fossils.
What is "hard"?
100
Plant leaves may form a fossil called a(n) ____________________, a thin layer of carbon on rock.
What is carbon film?
100
A type of organism that no longer exists on Earth is said to be ___________.
What is extinct?
100
The three main branches of science are earth and space science, physical science, and ____________________.
What is Life Science?
100
A mistake in the design of an experiment that makes a certain result more likely is called experimental ________ .
What is bias?
200
Scientists who study fossils are called __________.
What is a paleontologist?
200
The preserved remains or traces of organisms that lived in the past.
What are fossils?
200
Radioactive dating works best with this type of rock.
What is igneous rock?
200
Rachel Carson was a biologist. She worked in the branch of _____________ science.
What is Life Science?
200
Scientists who always report their observations and results truthfully possess the attitude of ____________________ .
What is honesty?
300
Scientists know how groups of animals changed over time by studying information contained in the _____________ ____________.
What is fossil record?
300
A fossil formed when minerals replace all or part of an organism is called a __________.
What is a petrified fossil?
300
The _________ age of a rock is its age compared with the ages of other rocks.
What is relative?
300
The study of rocks, weather, and planets is part of __________ science, one of the three main branches of science.
What is Earth/Space Science?
300
Scientists who are eager to learn more about the topics they study possess the attitude of ____________________.
What is curiosity?
400
______________fossils are helpful to geologists because they reveal the relative ages of the rock layers in which they occur.
What is index?
400
The study of fossils has allowed scientists to describe past environments and the _______ of life.
What is history?
400
The time it takes for half of the radioactive atoms in a sample of a radioactive element to decay is the element’s _________.
What is half-life?
400
The branch of ____________________ science includes chemistry, the study of the tiny particles that make up all things.
What is Physical Science?
400
A scientific ____________________ is a well-tested explanation for a wide range of observations or experimental results.
What is a scientific law?
500
Sometimes forces inside Earth turn rock layers over completely. This is called __________.
What is folding?
500
The fossil record shows that life on Earth has changed over time. For example, paleontologists have found that older rocks contain fossils of ___________ organisms.
What is simple?
500
Geologists use radioactive dating to determine the ________ ages of rocks.
What is absolute?
500
Geology is the study of rock layers, volcanic activity, and the age of rocks. This is most related to __________ science.
What is Earth and Space Science?
500
____________ bias describes when your likes and dislikes affect how you think about something.