NMDA reÂ·cepÂ·tor. a type of glutamate receptor that participates in excitatory neurotransmission and also binds N-methyl-d -aspartate; may be particularly involved in the cell damage observed in individuals with Huntington disease.
â Ultramafic magma is extremely low in silica, with less than 45 percent of the same, but rich in heavier elements like iron and magnesium. It can have a temperature of about 2732 Â°F. It has very low viscosity and thus, its eruptive behavior is gentle.
C The crust is made out of solid nickel and iron. D The crust is made of molten rock that flows like a thick, gooey syrup. 3 The core of Earth is made out of iron and nickel. The outer core's. temperature is so hot that it melts the metal.