Why do composite volcanoes consist of alternating lava and pyroclastic layers?
A)Composite cones are created by lava composition alternating between basalt and rhyolite.
B)Composite cones typically are interlayered with lava flows from nearby shield volcanoes.
C)Composite cones are created by a mixture of explosive activity and lava flows.
D)The lavas in composite cones are typically rhyolitic in composition.

Question

Quizplus · Accepted Answer

Composite volcanoes are formed by a combination of explosive eruptions that produce pyroclastic material and lava flows, which solidify to form alternating layers. The explosive eruptions can produce ash, rocks, and other materials that can accumulate at the summit of the volcano or be carried down the sides by landslides and lahars. The lava flows can also build up the volcano's shape and form the layers that make up the cone. Therefore, the alternating lava and pyroclastic layers are the result of both explosive activity and lava flows.

Why Do Composite Volcanoes Consist of Alternating Lava and Pyroclastic