Answer Happy

each of the following volcanic or plutonic features with its definition. flood basalts (lava plateau) dike columnar joints batholith lava tube caldera pillow basalts sill volcanic neck Very fluid lava spills onto surface and flows over extremely large area. This may happen repeatedly in one area as it did to form the Columbia Plateau. Tabular intrusion of magma that is parallel to bedding planes. Remnants of an eroded volcano, like Ship Rock in New Mexico. Tabular intrusion of magma that cuts across bedding planes. Polygonal cracks produced as lava cools. The cracks form perpendicular to the cooling surface. seafloor from a submarine vent. A mass of inter-grown plutons, like the Sierra Nevada. Rounded blobs of lava formed as lava chills as it flows onto the Collapsed peak of a volcano formed following evacuation of eruption like the one that formed Crater Lake in Oregon. magma chamber during an extreme An underground cavity left behind after fluid lava flowed away. They are formed as lava streams develop a thick skin that insulates the lower flow from cooling. Eventually, the lava stops flowing and leaves a cavity behind. Usually these features are very long and sinuous. Some are large enough to walk through. 10a. Label the adjacent diagram of a volcano and its products. Conduit or feeder dike Lava flow Layered lava flows and pyroclastics Magma chamber Pyroclastic cloud Vent in summit crater Pyroclastic cloud (ash) Country Rock b. What type of volcanoes exhibit the features listed above? By now you should know the difference between the Continental Drift Hypothesis and the Plate Tectonics Theory. You should understand how earthquakes are generated, where they are most likely to occur, and what dangers are associated with them. You should know how volcanoes are formed, what features of lava cause various landforms, and which volcanoes pose the most serious threat to people and communities.