Rhyolite lava choose one: a. has less silica than basalt lava has. b. may form a lava fountain above the vent. c. may be squeezed upward and out of the vent to create a lava curtain. d. indicates the tendency for explosive activity.

D) indicates the tendency for explosive activity.

Explanation: Rhyolite lava is the lava that can be obtained from volcano in the viscous form that flows in slow manner. The viscosity of the rhyolite is due to the felsic extrusive rock .It is usually obtained in the shape of lava domes after piling from the flow can be taken as the sign for explosion from volcano.

Other options are incorrect because rhyolite lava contains more silica than basalt lava.It forms the shape of dome after the piling and not vent.  It is not squeezed to form lava curtain rather form the dome. Thus, the correct option is option(D).    

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