Which evidence suggests that the materials in the asthenosphere are near their melting point? Choose the correct answer. The asthenosphere is made of lighter elements.

The temperature of core samples taken from the asthenosphere is near 500 K.

The velocity of seismic waves increases suddenly when they enter the asthenosphere.

The velocity of seismic waves decreases suddenly when they enter the asthenosphere.

The asthenosphere is made of lighter elements.

Explanation:

The asthenosphere has obtained its name from Greek word called asthenis, which mean weak. The strength of asthenosphere is lower than that of overlying lithosphere. If the temperature of lithosphere raises high enough then asthenosphere will melt.  This layer is ductile and deforms very easily.

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hurricanes form in warm water