Classifying Rocks
Geologists classify rocks into 3 major groups
What is igneous, sedimentary, and metamorphic
Igneous rock that formed from magma and cooled very slowly UNDERNEATH the earth's surface is called ________.
What is intrusive rock
These small pieces or particles make up sedimentary rock. They can be other rocks or plant and animal organisms
What is sediments
This is how metamorphic rocks are created.
What is extreme heat and pressure
Magma cools and crystallizes in the cycle forming _______ rock
What is igneous rock
The type of rock that forms from magma or lava cooling
What is igneous rock
This type of rock is formed from lava ON the earth's surface.
What is extrusive rock
This type of rock can be found on the local streets during the winter.
What is rock salt
These types of rocks can become metamorphic rocks
What is igneous, sedimentary and other metamorphic rocks
Igneous rock transform to sediment by processes called ___________ & ____________
What is weathering and erosion
The small units that make up a rock and its texture are called __________.
What is grains
Daily Double - An extrusive rock with dark color, fine grains and low silica
Daily Double - What is basalt.
Sedimentary rocks can form from deposits made in ___________
What is streams or oceans
The process in which magma comes in contact with existing rock
What is contact metamorphism
The layers of sediment become pressed together over time
What is compaction
Geologists study the ________ & ________ of a rock in order to identify it.
What is texture and composition
This type of igneous rock is black with a glassy texture. There is a picture in your textbook.
What is obsidan
This type of rock is formed by organisms. Coal was the example we gave in class.
What is the biochemical or organic rock
The texture of a metamorphic rock arranged in parallel layers is called
What is foliated
The tectonic process that forces rocks onto the earth's surface is called __________
What is uplift
Igneous rock cools very quickly.When it forms the rock could be described as _________.
What is smooth or shiny or no visible crystals
This igneous rock can float in water, it also has holes due to the release of gases
What is pumice
This type of sedimentary rock is made up of broken pieces of rock and minerals
What is clastic rock
Limestone becomes ___________ under extreme temperature or pressure.
What is marble?
Daily Double - The processes by which sediments become sedimentary rocks - three words
Deposition, compaction or cementation