Create a doc, ppt, or pdf document (Word, Google Docs, Powerpoint, Google Slides, or pdf; please convert Keynote documents to ppt or pdf) that is a photo diary showing photos of real world examples of the following 8 igneous landforms along with photo(s) that show the kind of rock found there.
MAKE THIS DOCUMENT SO IT WILL BE A USEFUL VISUAL REFERENCE DURING EXAM #2.
The eight igneous landforms to investigate are:
lava dome and its rock type(s)
cinder cone and its rock type(s)
stratovolcano and its rock type(s)
- shield volcano and its rock type(s)
- igneous dike and its rock type(s)
- igneous sill and its rock type(s)
- columnar jointing in a lava flow and its rock type(s)
- pillow lava and its rock type(s)
- For each of the 8 igneous landforms, please include the following:
- (40 pts) A photo of an example of the landform itself with a label and the geographic name (if it has one) of the particular one you are showing, and where in the world this particular feature is located
- (40 pts) A photo of the type or types of igneous rock that are dominant on that particular feature—in other words, if you traveled to that feature, what is the main rock you would find there? (you may need to include more than one rock image per igneous landform if you find that multiple types of rock are found at that landform—but limit yourself to no more than 3 rock images per igneous landform.) Name the igneous rocks shown AND label if they are felsic, intermediate, or mafic in composition. Look up unfamiliar words on the internet; there are many different types of volcanic rocks. If you can’t figure out if a particular kind of rock is felsic, intermediate, or mafic you can ask me. Consult the advice on rock types below for some of the more common igneous rock names.
(10 pts) Its latest history—when did it form or last erupt?
(10 pts) An indication of its size; elevation/height, small and if it is walkable or really big (how many km across), etc.
- Advice on rock types
- The rock types that might occur at the 8 igneous landforms include the following (but this is not a complete list):
- Pumice—can be mafic, intermediate, or felsic
- Scoria—typically mafic, but you might find otherwise
Obsidian—typically felsic, but can be mafic or intermediate
Tuff—can be mafic, intermediate, or felsic
Basalt--mafic
Andesite--intermediate
Rhyolite—felsic
Felsic indicates that the rock’s composition is greater than 69% silica (SiO2) (so less iron and magnesium in the rock).
Intermediate indicates that the rock’s composition is between 52-69% silica.
Mafic indicates that the rock’s composition is between 45-52% silica (so more iron and magnesium rich rock).
There are many different types of volcanic rocks with many different names. If you encounter an unfamiliar name, look it up and figure out from the description if it is felsic, intermediate, or mafic.
You may see more than one rock type listed for an igneous landform. That is okay. A volcano is typically made out of more than one type of igneous rock. Go ahead and list what you see, but pay attention to any indications of what might be the dominant rock type at that landform (if that is indicated).
Websites that might be helpful:
http://volcano.oregonstate.edu/
https://www.volcanodiscovery.com/volcanoes.html
https://volcano.si.edu/