Warm-Up 9-12. If a region of a map has contour lines close together what does that tell you about the region? Why do contour lines never overlap? Draw a small contour map of a 100m tall mountain with two peaks. Maps and Topography! To LITHOSPHERE!. Rocks. What is a Rock?.
Maps and Topography! ToLITHOSPHERE!
Take about 10min to quietly read the article.
Then answer the following questions:
What activities in your life are dependent upon the successful work of a geologist?
How could an understanding of geology help you understand the world around you?
What did you find the most interesting about this article?
Does anything about this article make you nervous?
Igneous rocks are formed from the cooling down of magma or lava.
INTRUSIVE rocks cooled slowly INside of the earth. Composed of larger crystals
EXTRUSIVE means “out of the earth”
It cooled on the surface of the earth and has small crystals
Igneous rocks are classified according to the composition and texture.
Composition is the minerals that the rock is made of
Felsic rocks: light colored, high silica content
Mafic rocks: dark rock, low silica content
Texture is the size, shape, arrangement, and distribution of those minerals in the rock.
There are 4 textures: glassy, fine-grained, course-grained, and porphyritic.
Glassy – obsidian
Fine-grained - basalt
Course-grained - Granite
Porphyritic means that it has large crystals with small ones also.
Sediments are pieces of solid material that have been weathered and then deposited
Sedimentary rocks are formed when rocks are broken down into sediments (weathered) and compacted together. (Compaction and cementation)
Sedimentary rocks are classified
3 classifications: clastic, chemical, organic
1. They are the most common sedimentary rock
Formed when a lake or ocean dries up, leaving behind minerals.
Calcite, Halite, and Gypsum are examples
They are formed from the remains of once living things
Coal is made from plant remains.
1. The rock cycle is the continuous changing and remaking of rocks.
2. Igneous rocks and sedimentary rocks may be transformed by heat, pressure, and chemical reactions into metamorphic rocks.
They also may be remelted into an igneous rock.
Or a metamorphic rock can be weathered to form a sedimentary rock.
Heat And Pressure
Heat And Pressure
4. Any rock can be changed into another rock!
(Things to think/write about: Are there different types of rocks? If so, what makes them different? Why are rocks different colors? Why do rocks have different textures?)
Rock Cycle Vocabulary