Millions of years
How much time is usually required for useful mineral resources to form in Earth's crust?
Gold, Silver, and Alluminum
List three examples of metals.
Sulphar and Quartz
List two examples of nonmetals.
Gold, Silver, and Copper
List three examples of minerals that can be native elements.
Two or More
How many elements do most minerals in Earth's crust contain?
Cinnabar
Ore from which mercury can be removed.
Native Element
Metallic mineral that can exist in Earth's crust as a nugget of pure metal.
Bauxite
Ore from which alluminum can be removed.
Ore
Mineral deposit from which mineral resources can be removed profitably
Magnetite
Ore from which iron can be removed.
Compound
Substance consisting of two or more elements.
Chromium, Nickel, and Lead
List three ores that form within cooling magma.
They sink.
What happens to dense metallic minerals as magma cools?
Contact Metamorphism
The process that occurs when magma comes into contact with existing rock is ______.
Ores
Heat and chemical reactions with hot fluids from magma sometimes change the surrounding rock and form ____.
Hydrothermal Solutions
Hot fluids that can move through small cracks in rock are ____.
Veins
Narrow zones of rock formed when minerals precipitate from a hydrothermal solution are called _____.
Lode
An ore deposit that forms from many thick mineral veins in a small region is called a ____.
Gold, Tin, Lead, and Copper
List four valuable heavy minerals that are commonly found in veins.
Tiny fragments of native elements, such as gold, are released from rock as it breaks down from weathering.
What happens first when movement of water helps form ore deposits?