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Geology
Earth History
46
Geology
7th Grade
04/03/2007

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Term
CALCITE
Definition
It is a common constituent of sedimentary rocks, limestone in particular.
Term
CLEAVAGE
Definition
When a mineral breaks if it is smooth and flat it has cleavage.
Term
COLOR
Definition
One of the ways that a mineralogist uses to clasify minerals.
Term
HARDNESS
Definition
Is the ability of a mineral to resist being scratched.
Term
LUSTER
Definition
Luster describes how a mineral reflects light from its surface.
Term
VITREOUS
Definition
Viscous is a pearly clay, found in some luster. Shiny like glass.
Term
TRANSPARENT
Definition
Transparent is where you can see through it.
Term
FRACTURE
Definition
When a mineral breaks but does NOT leave cleavage it is a fracture.
Term
TRANSLUCENT
Definition
When you try to look through a mineral and you can barely see through it, it is translucent.
Term
OPAGUE
Definition
Opague is when you can NOT see through a mineral at all.
Term
STREAK
Definition
Streak is a color of a mineral in a powder form.
Term
WHAT ARE THE 7 PROPERTIES OF A MINERALS?
Definition
1. Streak

2. Crystal Shape

3. Fracture

4. Hardness

5. Transparency

6. Luster

7. Color

Term
WHAT ARE THE TWO CLASSIFICATIONS OF IGNEOUS ROCKS?
Definition
Volcanic which is Extrusive
Plutonic which is Intrusive
Term
HOW ARE IGNEOUS ROCKS MADE?
Definition
Plutonic rocks are formed from melted rock called magma.

Volcanic rocks are formed when volcanoes erupt. When the magma appears above earth it is called Lava. Volcanic rocks are formed as the lava cools above ground.

Term
MAGMA
Definition
Melted rock inside the earth.
Term
LAVA
Definition
When Magma appears above the earth it is called Lava.
Term
SEDIMENTARY ROCKS
Definition
Water deposited rocks are called sedimentary rocks. They are made of up of any type of rock material that has broken down. Small bits are called sediment.
Term
IGNEOUS
Definition
Igneous rocks are formed from cooled and hardened magma.
Term
WHAT ARE THE THREE CLASSIFICATIONS OF SEDIMENTARY ROCKS?
Definition
1. Clastic

2. Chemical

3. Organic

Term
HOW ARE SEDIMENTARY ROCKS MADE?
Definition
1. Clastic-sedimentary rocks are formed from fragments of other rocks. example: shale & sandstone

2. Chemical-sedimentary rocks are formed from mineral grains that fall out of a solution. example rock salt and most limestones

3. Organic-sedimentary rocks are formed from the remains of plants and animals. example: coal

Term
WHAT IS THE PRINCIPLE OF SUPERPOSTION?
Definition
Superposition is how the layers of rocks and soil are layered down according to age. The oldest layer is on the bottom and the youngest layer is on the top.
Term
METOMORPHIC
Definition
Metomorphic rocks are rocks that when heat and pressure are applied will change.
Term
WHAT ARE THE TWO CLASSIFICATIONS OF METOMORPHIC ROCKS?
Definition
1. Foliated-layers splits easy

2. Non-foliated-no visable layers,like marble

Term
NAME THE PARENT METOMORPHIC ROCK FOR QUARTZITE
Definition
Sandstone
Term
NAME THE PARENT METOMORPHIC ROCK FOR MARBLE
Definition
Limestone
Term
NAME THE PARENT METOMORPHIC ROCK FOR SLATE
Definition
Shale
Term
NAME THE PARENT METOMORPHIC ROCK FOR GNEISS (pronounced nice)
Definition
Granite
Term
NAME THE PARENT METOMORPHIC ROCK FOR SCHIST
Definition
Basalt
Term
PLUTONIC ROCKS
Definition
Plutonic Rocks are igneous rocks, supposed to have consolidated from a melted state at a great depth from the surface from a melted state at a great depth from the surface.
Term
ROCK
Definition
Any natural deposit forming a part of the earth's crust.
Term
SAND
Definition
Sand is defined by its size. Sand is larger than silt and smaller than gravel.
Term
MINERAL
Definition
Minerals are inorganic substance occurring in nature, having definite physical properties, and, usually, a definite crystalline form.
Term
GEMSTONE
Definition
Rocks and minerals that have been cut and polished.
Term
MINERALOGY
Definition
The study of minerals.
Term
HUMUS
Definition
Humus is the dark organic material in soils, produced by the decomposition of vegetable or animal matter and essential to the fertility of the earth.
Term
VOLCANIC
Definition
Igneous rock produced by eruption and solidified on or near the earth's surface.
Term
QUARTZ
Definition
A very hard mineral composed of silica, found worldwide in many different types of rocks, including sandstone and granite.
Term
WHAT IS THE DIFFERENCE BETWEEN WEATHERING AND EROSION?
Definition
Weathering is different from erosion because the weathering process by nature is gradual. Erosion is different because it takes material away from the earths surface.
Term
WHAT ARE THE TWO CLASSIFICATIONS OF SAND?
Definition
Biogenic and abiogenic
Term
EROSION
Definition
The wearing away of the earths surface.
Term
WENTWORTH
Definition
Wentworth is the scale geologists use to compare rock particle sizes.
Term
ICE WEDGING
Definition
Ice wedging is when the temp drops below 0 degrees it freezes and water is in the cracks of rocks. The ice freezes and expands and the rock cracks.
Term
NATURAL CEMENT
Definition
Natural cement is when dissolved minerals settle and bind together. Silica, iron oxide, and calcite are examples of the minerals.
Term
STRATIFICATION
Definition
Sedimentary rocks show special features that help identify them. One of these is stratification which is the arrangement of layers.
Term
DESCRIBE HOW CONSTRUCTIVE FORCES BUILD UP THE EARTHS SURFACE. THREE EXAMPLES
Definition
1. Mountain building-Convegent plates smashes into continental plates.

2. Volcanoes

3. Island formation-oceanic to oceanic convergent plates.

Term
DESCRIBE HOW DESTRUCTIVE FORCES BUILD UP THE EARTHS SURFACE. THREE EXAMPLES
Definition
1. Weathering

2. Erosion-wind, water and wave wash away the earth's crust

3. Subduction

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