activity 2.9 the origin of magma ACTIVITY 2.9 The Origin of Magma Name: Course/S
ID: 118387 • Letter: A
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activity 2.9 the origin of magma
ACTIVITY 2.9 The Origin of Magma Name: Course/Section: Date: PROCEDURES FOR MELTING EXPERIMENT IN ACTIVITY 2.9 A. Examine the pressure-temperature (P-T) diagram for mantle peridotite in FIGURE 2.8, and locate point X. This point represents a mass of peridotite buried 80 km underground. 1. According to the continental geothcrmal gradient, 1. Turn the hot plate on a low setting (about 2 or 3 on most commercial hot plates) and allow it to heat up in a safe location (be careful not to touch hot surfaces directly). rocks buried 80 km beneath a continent would normally be heated to what temperature? 2. Next, place two sugar cubes on a flat piece of aluminum foil or in aluminum foil baking cups. Label on the foil) one sugar cube "dry." Moisten the second sugar cube with about 4 or 5 drops of water and label it "wet." 2. According to the oceanic geothermal gradient, rocks buried 80 km beneath an ocean basin would normally be heated to what temperature? Dropper 3. Is the peridotite at point X a mass of solid, a mixture Aluminum foil of solid and liquid, or a mass of liquid? How do you know? DRY WET 4. What would happen to the mass of peridotite at point X if it were heated to 1750°C? 3. Carefully place the aluminum foil with the labeled sugar cubes onto the hot plate and observe what happens. When one of the sugar cubes begins to 5. What would happen to the mass of peridotite at point melt, use crucible tongs and/or hot pads to remove X if it were heated to 2250 °C the foil and sugar cubes from the hot plate and avoid burning the sugar Hot surface Aluminum foil B. At its current depth, the peridotite at point X in FIGURE 2.8 is under about 25,000 atrm of pressure. 1. At what depth and pressure will this peridotite begin DRY WET to melt if it is uplifted closer to Earth's surface and its temperature remains the same? Depth: lPressure: 2. What is the name applied to this kind of melting? Low setting 4. Turn off and un-plug the hot plate as soon as you 3. Name a process that could uplift mantle peridotite to finish #3 above. Be careful not to touch the hot surface! start it melting in this way, and name a specific plate tectonic setting where this may be happening now (Him: Study FIGURES 2.2, 2.5, and 2.6.) FIGURE 2.9 Procedures for melting experiment in Activity 2.9. Be careful not to burn yourself on the hot surface or in molten sugar. Do not create a hazard by burning the sugar until it smokes or catches fire 70Explanation / Answer
SOLUTION:F.
1) A plate boundary is where two boundaries of two different plates meet and interact with one another in the tectonic plates. this diagram repergent convergent plate boundaries.
A convergent boundary is where two tectonic plates converge, which usually (probably always) results in one plate subducting beneath the other.
2) When plates of similar density collide, they will keep pushing into each other, causing earthquakes in the process and forming mountain ranges. If an oceanic plate meets a continental plate, the oceanic plate will disappear into the mantle of the Earth, melting and causing local formations of magma, which will rise and form volcanoes.
3) these plate collided is called subduction zone. Along one of these subduction zones, one'll also get volcanoes. The subducting plate will reach a point in the mantle that it melts completely, leaving behind brand new magma. This magma is hot and less-dense than the surrounding mantle rock, so it rises like a very slow helium party balloon, eventually popping out of the surface. If this is an oceanic-continental convergence, you'll get a "dry" volcanic mountain range
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