What type of volcanoes are the Cascade volcanoes?
Volcanoes within the volcanic belt are mostly stratovolcanoes along with the rest of the arc, but also include calderas, cinder cones, and small isolated lava masses. The eruption styles within the belt range from effusive to explosive, with compositions from basalt to rhyolite.
What is a Cascade Range volcano?
Active volcanoes dominate the skyline of the Pacific Northwest. Cascade Range Volcanoes (Public domain.) The familiar snow-clad peaks of the Cascade Range are part of a 1,300 km (800 mi) chain of volcanoes, which extends from northern California to southern British Columbia.
What type of plate boundary is the Cascade Volcanic Arc?
convergent plate boundary The Cascadia Subduction Zone, extending from northern California through western Oregon and Washington to southern British Columbia, is a type of convergent plate boundary. Two parallel mountain ranges have been forming as a result of the Juan de Fuca Plate subducting beneath the edge of North America.
What are the Cascade volcanoes made of?
The High Cascades include all of the highest volcanoes and all of the active volcanoes in the range. Most of these volcanoes are formed from andesite, and most are built on top of a platform of basaltic shield volcanoes. The basalt lava flows that form this platform are well exposed in many places in the High Cascades.
What are the Cascades?
The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades.
How did the Cascade Arc form?
The last remnant of the Farallon Plate, now called the Juan de Fuca Plate after a Spanish explorer, began subducting along the western margin of Washington. Melting of the Juan de Fuca Plate at depth intruded magma into the continental margin to form the Cascade Arc.
How did the Cascade Volcanic Arc form?
The last remnant of the Farallon Plate, now called the Juan de Fuca Plate after a Spanish explorer, began subducting along the western margin of Washington. Melting of the Juan de Fuca Plate at depth intruded magma into the continental margin to form the Cascade Arc.
How was the Cascade Arc formed?
Formation. The Cascade Arc was originally created by subduction of the now vanished Farallon Plate at the Cascadia subduction zone. After 28 million years ago, the Farallon Plate segmented to form the Juan de Fuca Plate, which continues to subduct under the Pacific Northwest of North America.
Where are the Cascades?
The Cascade Range is part of a vast mountain chain that spans for over 500 miles, from Mount Shasta, in northern California to British Columbia in the north. The beautiful North Cascade Range, located in northwestern Washington State, has some of the most scenic, and geologically complex mountains in the United States.
When did the Cascade volcanoes form?
About two million years ago years ago, these ancestral mountains had eroded significantly, forming the foundation of current Cascade volcanoes. About two million years ago eruptions began construction of the ancestral cones in the vicinity of the present Cascade volcanoes.
What do Cascades mean?
Definition of cascade (Entry 1 of 2) 1 : a steep usually small fall of water especially : one of a series. 2a : something arranged or occurring in a series or in a succession of stages so that each stage derives from or acts upon the product of the preceding blood clotting involves a biochemical cascade.
What is an example of a cascade?
The definition of a cascade is a waterfall over a steep and rocky area or anything that resembles a waterfall. An example of cascade is what one will find at Niagara Falls. An example of cascade is hair falling down out of a bun.
What is called cascade?
Definition of cascade (Entry 1 of 2) 1 : a steep usually small fall of water especially : one of a series. 2a : something arranged or occurring in a series or in a succession of stages so that each stage derives from or acts upon the product of the preceding blood clotting involves a biochemical cascade.