Chapter 12 - Geologic Time and Concepts

Inland Sea

• a body of water that forms when oceans flood continents

• a large lake surrounded by mountains

• a river that flows into the ocean

• a small pond in a desert area

Eon

• the longest unit of geologic time

• a period of 10 million years

• a type of rock formation

• a geological event lasting a few years

Hypothesize

• to make an assumption about something that is not positively known

• to prove something with evidence

• to guess without any basis

• to analyze data thoroughly

Period

• a subdivision of a geologic era

• a type of rock formation

• a measure of time in history

• a phase of biological evolution

Glacial Groove

• a groove made by rocks carried in glaciers

• a type of rock formation found in deserts

• a deep valley formed by river erosion

• a crack in the earth's crust caused by tectonic activity

Supercontinent

• A large body of water that separates continents

• An ancient landmass that separated into present-day continents

• A type of geological formation found in mountains

• A modern-day continent that is still forming

Land Bridge

• A type of bridge made of land

• A landform that connects two continents that were previously separated

• A bridge that is made of natural materials

• A geographical feature that separates two bodies of water

Era

• a subdivision of a geologic eon

• a type of rock formation

• a period of human history

• a measure of time in seconds

Theory

• A hypothesis that has not been tested

• A set of assumptions or statements devised to explain an aspect of the natural world

• A collection of unrelated facts

• A method of scientific inquiry

Epoch

• a subdivision of a geologic period

• a type of rock formation

• a major extinction event

• a period of human history