Rocks
Classifying Rocks
Rock Characteristics
Origin of Rocks
More about Rocks
100
Minerals are composed of elements or compounds (more than one element combined). Rocks are composed of ________ (some rocks contain only one and some contain several).
What is “minerals”?
100
This igneous rock is dark-colored and has lower silica content than granite. It has mineral crystals that are too dark to see with the naked eye.
What is basalt?
100
If the grains in a rock lie in a pattern of flat layers or formed swirls or colored strips, the grain pattern is called this
What is banded?
100
This major type of rock forms when a rock is “changed” by heat or pressure or by chemical reactions...most are formed deep underground
What is metamorphic?
100
Most common type of extrusive rock
What is Basalt?
200
To study a rock sample, geologists observe these 3 physical properties of the rock
What are the rocks mineral composition, color and texture?
200
The three major rock groups
What are igneous, sedimentary and metamorphism?
200
Grains that are large and easy to see are said to be ______-grained and are formed from slow cooling
What is “coarse”?
200
A diagram of this type of rock’s origin
What is igneous?
200
This determines the color of granite
What is the mineral composition?
300
The 20 (approx) minerals that make up the Earth’s crust
What are the rock-forming minerals?
300
The look and feel of a rock’s surface
What is texture?
300
A rock’s _______ is the way that the rock formed.
What is “origin”?
300
Igneous rocks formed from lava that erupted onto the Earth’s surface
What is extrusive rock?
300
Igneous rocks formed from magma hardened beneath the Earth’s surface
What is intrusive rock?
400
This igneous rock has a rough surface that is formed when gas bubbles are trapped in fast-cooling lava, leaving spaces in the rock. It is often used as an abrasive for cleaning and polishing or to slough off the dead skin on your feet
What is pumice?
400
Most rocks are made up of particles of minerals or other rocks, which geologists call _____.
What is “grains”?
400
This major type of rock forms from the cooling of magma (underground) or lava (on the Earth’s surface)
What is igneous?
400
Extrusive igneous rocks are _______-grained
What is “fine”?
400
Intrusive igneous rocks are ________-grained
What is “coarse”?
500
This rock is high in silica content. It is speckled in light dusty pinks, blacks and grays, so you can tell it is made up of more than one mineral. It is generally made of a few common minerals; feldspar, hornblende, quartz and mica. It is commonly used as building material because it is hard, dense and durable
What is granite?
500
Scientists describe a rock‘s texture based on these 3 characteristics of the grains in the rock
What are the size, shape and pattern of the grains?
500
This major type of rock forms when small particles of rocks or the remains of plants and animals are pressed and cemented together...this type forms in layers buried below the surface
What is sedimentary?
500
Most common type of intrusive rock
What is granite?
500
Basalt, granite, rhyolite, obsidian, pumice
What are examples of igneous rock?