Unit 1

The core

northern hemisphere axis

Once living organism becoming a fossil

Using various techniques to give a time in the past that an event actually occurred.

Know sequence of events, doesn’t give a year or date to an event.

Identify short period of time. Distinctive, wide spread and lived for brief amount of time.

Remains or traces of an ancient organism

Hardness, density, luster, streak

Naturally formed non living earth mineral

Form from cooling magma

Cool and solidify beneath surface. Visible crystals

Cool and solidify above surface. Form from volcanos. more rapid cooling.

Competition and cementing together of sediments. Broken pieces of gravel,sand, and clay.

Form when minerals in existing rock are changed by heat and pressure within the earth.

Present is the key to the past