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What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box