Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
19 Cards in this Set
- Front
- Back
|
Uniformitariaanism |
The geologic processes that operate today also operated in the past. |
|
|
Erosion |
The procces of wearing down and carrying away rocks. |
|
|
Wethering |
The process that breaks down rock and other substances. |
|
|
Mechanicle Weathering |
Weathering in which a rock is physically broken into smaller pieces. |
|
|
Chemical Weathering |
The process that breaks down rock through chemical changes. |
|
|
Abrasion |
The wearing away of rock by rock particles carried by water ice wind or gravity. |
|
|
Frost Wedging |
Wedges of ice in rocks widen and deepen cracks. |
|
|
Oxidation |
Iron combines with oxygen in the presence of water. |
|
|
Permeable |
A material is full of tiny, connected air spaces that allow water to seep through it. |
|
|
Soil |
The loose weatherd material on earths surface in which plants can grow. |
|
|
Bedrock |
The solid layer of rock beneath the soil. |
|
|
Humus |
The decayed organic material in soil. |
|
|
Fertility |
A measure of well the soil supports plant growth. |
|
|
Loam |
Soil that is made up of about equal parts of clay, sand, and silt. |
|
|
pH scale |
Measures acidity. |
|
|
Soil Horizon |
A layer of soil that differs in color, texture, and composition from layers above or below it. |
|
|
Topsoil |
A crumbly, dark brown soil that is a mixture of humus, clay, and other materials. |
|
|
Subsoil |
Consists of clay and other particles of rock, but little humus. |
|
|
Decomposers |
The organisms that break the remains of dead organisms into smaller pieces and digests them with chemicals |
