Tridymite is associated with

a. Felsic Volcanism

b. Ultramafic Volcanism

c. Mafic Volcanism

d. Silicic Volcanism

ANSWER: Silicic Volcanism

Explanation:

On Earth, tridymite is formed at high temperatures in an explosive process called silicic volcanism.

Mount St Helens, the active volcano in Washington State, and the Satsuma-Iwojima volcano in Japan are examples of such volcanoes.

Silicic Volcanism is characterized by the eruption of magma that is rich in lighter elements such as silicon, oxygen, aluminum, sodium, and potassium.

Silicic volcanoes are associated with the melting of continental crust and often have explosive eruptions.