This grаph indicаtes the melting rаnge fоr mantle rоck at different pressures (left) and the melting range fоr mantle rock in the presence of H2O (right). Image Description Image of two graphs. The graph on the left shows pressure (y-axis) versus temperature (x-axis). At the bottom right where temperature and pressure are low, the rock is all solid. The top right of the graph shows the rock as all liquid where temperature is high and pressure is low. Starting with low temperature and pressure, as you move toward greater temperature and pressure, a zone of melting runs from the top and bottom along the center of the graph. It starts where pressure is high and temperature is low and curves to the bottom right of the graph as temperature and pressure both increase. The graph on the right shows pressure versus temperature with water. At the bottom right where temperature and pressure are low, the rock is all solid. The top right of the graph shows the rock as all liquid where temperature is high and pressure is low. Starting with low temperature and pressure, as you move toward greater temperature and pressure, a zone of melting with water cuts across the first half of the graph. It starts where pressure is high and temperature is low and stays in the melting zone as pressure increases and temperature stays low. As temperature gets higher alongside pressure, the meling zone with water curves to the bottom of the graph ending where you have medium temperature and high pressure. When ocean plates are subducted, water is introduced into the mantle. What effect does introducing water have on mantle rock?
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