~ Volcanoes ~
- This picture came from http://www.destination360.com/central-america/costa-rica/arenal-volcano
Here is a song/video on volcanoes: http://www.youtube.com/watch?v=PnilQsno2WI
- Volcanoes can erupt at unsuspecting times . If lava goes up to high and hardens over million of years it can form a lava plateau.
There are many types of volcanic landforms. There are volcanoes. One of the volcanoes are called shield volcanoes. Shield volcanoes form by thin layers of lava that is pouring out of the top of the volcano. They harden on top of previous layers that have formed before. Lava flows slowly until it builds a wide , gently sloping mountain. Also the shield volcano that is rising from a hot spot on the sea floor created the Hawaiian Islands. Another volcano is the cinder cone volcano. It is cone-shaped like hill or mountain. If the lava from the volcano is chunky and stiff it may create ash, cinders, and bombs. These objects pile up around the vent in a steep cone-shaped pile. The last volcano is the composite volcano. The lava flows with explosives eruptions of ash,cinder,and bombs. It comes out to be a composite volcano. composite Volcanoes are tall and they're cone shaped mountains which layers of lava alternates with the layers of ash.
This picture shows a lava plateau. To find this site go to...http://acommentpost.blogspot.com/2013/10/lava-plateau-explained.html
Plateaus is a big area of flat land elevated high on top of the ocean floor. Instead of regular plateaus we are gong to tell you about lava plateaus. Instead of forming mountains, the eruptions of lava form high, level areas are called lava plateaus. First lava flows out of several long cracks in a spot. Then thin runny lava goes far before cooling and hardens. Again and again a puddle of lava flows on top of earlier puddles of lava. After millions of years these layers of lava can form high plateaus.
This picture show an example of a caldera...http://cimss.ssec.wisc.edu/sage/geology/lesson3/concepts.html
A caldera is a hole left behind by a huge eruption. It is formed after an eruption that empties the vent and magma chamber. When the mountain becomes hollow the top of the mountain collapses which makes a caldera. An example of a caldera is Mt. Saint Helen.
This picture of a batholith is from...http://www.explorevolcanoes.com/Volcano%20Glossary%20Batholith.html
A batholith is a big rock formed when magma is cooled insde the crust. Batholiths form in the core of mountain ranges. An example of a batholith is in the Sierra Nevada mountains in California.
A batholith is a big rock formed when magma is cooled insde the crust. Batholiths form in the core of mountain ranges. An example of a batholith is in the Sierra Nevada mountains in California.
This diagram of a volcanic necks, sill, and dike is from: http://www.studyblue.com/notes/note/n/chapter-7-volcanoes/deck/2072420
A volcanic neck is hardened magma in a volcanoes pipe. It forms when magma hardens in a volcano's pipe. A sill is a slab of volcanic rock formed when magma squeezes between layers of rock. A sill forms when magma squeezes between layers of rock. Magma that forces itself across rock layers hardens to create a dike. These are all formed by magma.
A volcanic neck is hardened magma in a volcanoes pipe. It forms when magma hardens in a volcano's pipe. A sill is a slab of volcanic rock formed when magma squeezes between layers of rock. A sill forms when magma squeezes between layers of rock. Magma that forces itself across rock layers hardens to create a dike. These are all formed by magma.