Unit 3 lesson 1

1. A trace fossil is a fossilized structure that formed in sedimentary rock by animal activity on or in soft sediment.

2. The climate of an area describes describes the weather conditions in a specific area over a long period of time.Some materials that tell us about Earth's climate history are trees, sea- floor sediments, and ice.

3. Earths surface features are always changing. They tell us how the theory of pangea could possibly be true. They also can tell us how landforms have changed over time.

4. A fossil can tell us what happened in the passed and how environmental changes and life forms have changed.

5. Organisms can leave evidence of themselves, like in fossils. Fossils are the remains or "left overs" of an organism that lived a long time ago. The two main ways fossils are trapped is in Amber and in Asphalt, buried in rock, to become frozen, to become petrified.

6. The principle of uniformitarianism states that all processes from the past can be explained by current processes.