- Silica-rich igneous rock or magma with a relatively high content of potassium and sodium.
- originally created from gases released from volcanic eruption.
- 1) Higher ... contents produce higher viscosities.2) .... lavas have higher viscosities.3) Amount of ...., the more ....., the more fluid the lava.
- The ocean crust goes below the continental crust because?
- Yellowstone National Park marks the location of a huge....
- A volcano ________ forms in Earths crust when molten material reaches the surface.
- Geologists classify volcanic eruptions as quiet or _________.
- Japan and New Zealand are examples of strings of volcanic island known as
- A volcano erupts quietly if its magma it is
- Volcanoes form along the mid-ocean ridges, where two plates move together.
- From what kind of lava does pahoehoe form
- do all volcanoes form along plate boundaries?
- How many years ago Wegener believed the continents originally broke apart
- The Great Rift Valley in Africa has ____ boundary
- Rock structures on different continents support this theory
- Ocean floor rocks are ______ continental rocks
- The Andes Mountain Range of South America formed at a _____ boundary
- What do we call the moving blocks of earths lithosphere
- Earths core is approximatly 5200 degrees C but it is solid iron, why isnt it melted?
- explain how earthquakes and volcanos are related