what condition results in magma cooling and forming a \glassy\ igneous rock?\na. extremely slow cooling\nb…

what condition results in magma cooling and forming a \glassy\ igneous rock?\na. extremely slow cooling\nb. cooling in the presence of oxygen\nc. extremely rapid cooling\nd. partial melt cooling\nplease select the best answer from the choices provided\no a\no b\no c\no d

what condition results in magma cooling and forming a \glassy\ igneous rock?\na. extremely slow cooling\nb. cooling in the presence of oxygen\nc. extremely rapid cooling\nd. partial melt cooling\nplease select the best answer from the choices provided\no a\no b\no c\no d

Answer

Brief Explanations:

When magma cools extremely rapidly, there is not enough time for mineral crystals to form. This results in a "glassy" texture in the igneous rock. Slow cooling allows for the formation of larger crystals (so option a is incorrect). The presence of oxygen during cooling is not the key factor for a glassy texture (option b is wrong). Partial melt cooling is not related to the glassy formation mechanism (option d is incorrect).

Answer:

C. extremely rapid cooling