A'a, Pillow, and Pahoehoe are three kinds of this.

A'a, Pillow, and Pahoehoe are three kinds of this.

• A. Magma
• B. Ash
• C. Lava
• D. Gas

Answer: (C)

These terms describe molten rock that has erupted onto the surface. When magma reaches the surface and flows, it is called lava. The three names point to different forms lava can take: pahoehoe is smooth and ropy, a'a is rough and jagged, and pillow lava forms when lava erupts underwater and cools into rounded pillow shapes. Because they are all varieties of lava, lava is the best answer. Magma is the molten rock beneath the surface, while ash and gas refer to eruptive products, not the lava itself.

These terms describe molten rock that has erupted onto the surface. When magma reaches the surface and flows, it is called lava. The three names point to different forms lava can take: pahoehoe is smooth and ropy, a'a is rough and jagged, and pillow lava forms when lava erupts underwater and cools into rounded pillow shapes. Because they are all varieties of lava, lava is the best answer. Magma is the molten rock beneath the surface, while ash and gas refer to eruptive products, not the lava itself.