Volcanoes are often formed at plate boundaries. this is a convergent plate boundary. from the choices listed, pick the correct description of what happens before the volcano forms. a)denser continental plate pushes oceanic plate down. oceanic plate melts deep in the earth, magma rises up through weak spot. b)the less dense oceanic plate subducts under the denser continental plate. subducted plate melts due to heat and pressure. melted plate, now magma, rises up to the surface. c)as the more dense oceanic plate subducts under the less dense continental plate, it pulls the front edge of the less dense plate down, creating a deep zone or oceanic trench. d)the more dense oceanic plate subducts under the less dense continental plate. subducted plate melts due to heat and friction. melted plate, now magma, rises up to the surface.

Explain the cause for movement river valley civilization to early industrial centers

If you could drill a hole straight to the center of the earth, and keep track of what the hole is going through, youwould find: a) you would go through one sort of material, and then a different, denser material, and then a still-different, still-denser material, because the planet is made of concentric layers, sort of like an onion. b) you would go through one sort of material all the way to the center, because the planet is all mixed up. c) if your hole started at the north pole, you would go through different layers of different materials, but ifyour hole started at the equator, you would go through one sort of material all the way to the center. d) if your hole started at the equator, you would go through different layers of different materials, but if yourhole started at the north pole, you would go through one sort of material all the way to the center. e) you would strike diet pepsi when you got to the center.

Determine which of the two measurements in each set is lesser.10°f or 20°ca. 10-fb. 20°c