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Chapter 8 Vocabulary

Published on Nov 18, 2015

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PRESENTATION OUTLINE

Chapter 8 Vocabulary

By Dominik

fold mountain

A mountain made up mostly of rock layers folded by being squeezed together

fault-block mountain

A mountain made by huge tilted blocks of rocks separated from surrounding rocks by faults
Photo by Ken Lund

weathering

The breaking down of rocks into smaller pieces by natural processes

erosion

The picking up and removal of rock particles 
Photo by brewbooks

soil

A mixture of weathered rock, decayed plant and animal matter, living things, air, and water
Photo by arimoore

humus

 Material in soil formed by the breakdown of plant and animal material
Photo by Zane Selvans

soil horizon

Any of the layers of soil from the surface to the bedrock below
Photo by FortGirl

groundwater

Water that soaks into soil and rock by collecting in spaces between rock particles 

mass wasting

The downhill movement of Earth material caused by gravity

deposition

The dropping off of sediment 

glacier

A huge sheet of ice and snow that moves slowly over the land
Photo by .:Adry:.

till

A jumble of many sizes of sediment deposited by a glacier 

moraine

A deposit of many sizes of sediment in front of or along the sides of a glacier 

mineral

A naturally occurring solid in Earth's crust with a definite structure and composition

igneous rock

A rock that forms when hot, liquid lava cools and hardens into a solid

sedimentary rock

A rock that forms from pieces of other rocks that are squeezed or cement together

metamorphic rock

A rock that forms from another kind of rock that is changed by heat, pressure, or a chemical reaction

rock cycle

Rocks continually changing from one kind into another in a never-ending process

superposition

The idea that in a series of rock layers, the bottom layer is the oldest and the top layer is the youngest 

relative age

 The age of a rock as compared with another rock
Photo by Travis S.

geologic column

A listing of Earth's rock layers in order from oldest to youngest 

fossil

Any trace, imprint, or remains of a living preserved in Earth's crust 

index fossil

The remains of a living thing that was widespread but lived for only a short part of Earth's history

half-life

The time it takes for half the mass of a radioactive element in a rock to break apart, or decay, into other elements 

absolute age

The age of a rock in years, as determined by measuring the decay rate of its radioactive elements 

era

One of the four long stretches of time in Earth's history