1.3 minerals of earths crust

Question 1

evaporation

Answer 1

when a body of salt water dries up, minerals are left behind. As the water evaporates the minerals crystallize.

Question 2

metamorphism

Answer 2

high temperatures and pressures deep below the ground can cause the minerals in the rock to change into different minerals.

Question 3

deposition

Answer 3

surface water and ground water carry dissolved minerals into lakes or seas. The minerals can crystallize on the bottom of a lake or sea.

Question 4

reaction

Answer 4

water underground can be heated by hot rock. The hot water can dissolve some minerals and deposit other minerals in their place.

Question 5

cooling

Answer 5

melted rock can cool slowly under earths surface. As the melted rock cools, minerals form.

Question 6

ore

Answer 6

a natural material whose concentration of economically valuable minerals is high enough for the material to be mined profitable

Question 7

reclamation

Answer 7

the process of returning land to its original condition after mining is completed

Question 8

impurity

Answer 8

is a small amount of an element not usually found in the mineral

Question 9

color

Answer 9

color is the feature that determines the value of a gemstone

Question 10

subsurface

Answer 10

is used to remove ore that are deep underground

Question 11

surface

Answer 11

is used to remove ore near earths surface