The Fossil Record

Fossils can be as large as an entire animal or as small as ____.

Most fossils are preserved in sedimentary rocks that form when particles of ____, silt, clay, or lime muds settle to the bottom of a body of water.

The quality of fossil preservation varies depending on what factors?

Leaves and pollen can suggest what kind of ____ was there.

The type of sedimentary rock affects the quality of ____.

Radiometric dating relies on: A) The presence of index fossils B) The decay of radioactive isotopes C) The chronological order of rock layers D) The geologic time scale.

Fill in the blank: The ________ time scale is a timeline of Earth's history.

Which technique uses the proportion of radioactive isotopes to calculate the age of a sample?

Which of the following is not one of the four eons recognized by geologists?

What is the name given to all geologic time before the Cambrian Period?