Front

Something you notice using any of the five senses.

Back

observation

Front

A clue about life from the past that is preserved in rock.

Back

fossil

Front

A scientist who studies the processes and materials that form the solid part of Earth.

Back

geologist

Front

A type of rock formed from sediment that compacts and cements over time.

Back

sedimentary rock

Front

to stick together in the process of forming rock.

Back

cement

Front

small pieces of rock, such as silt or sand.

Back

sediment

Front

Something you figure out based on observations and information you already know.

Back

Inference

Front

to press together.

Back

compact

Front

What do scientists make to answer questions about the real world?

Back

model

Front

A thick sheet of rock formed from the same material.

Back

rock layer