Blog

A peak systolic velocity (PSV) ratio of ≥2 is associated with what level of stenosis?

Which vessel is commonly affected by Hypothenar Hammer Syndrome?

Which of the situations below describes a negative feedback cycle for temperature?  

When a planet forms in the disk of material around a protostar, what determines whether that planet will be a terrestrial or a jovian planet?

Which of the following correctly describes both the properties of  the asthenosphere and how we determined those properties?

What effect does introducing water have on mantle rock?

According to this graph, when did humans begin to have an effect on global temperatures? (You may find it helpful to use a piece of scratch paper as a straight edge to line up the temperature graph with the time scale.)

An element from column 1A on the periodic table will combine with an element from column 7A on the periodic table in a one-to-one ratio.   How many more electrons does an element in column 7A need to fill its shell?

At hot spots and diverging plate boundaries, less dense mantle rock, without any introduced water, is pushed up toward the surface. The rock stays at the same temperature. As mantle rock that is near its melting point rises toward the surface, which of the following happens?

Use this information to answer the next two questions: This graph indicates the melting range for mantle rock at different pressures (left) and the melting range for 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 meltling 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.