GEOLOGY

Detailed explanation-1: -A lava flow with a surface of rough, jagged blocks and sharp, angular projections is called a(n) . answer choices. pyroclastic flow.

Detailed explanation-2: -’A’ā (pronounced “ah-ah") is a Hawaiian term for lava flows that have a rough rubbly surface composed of broken lava blocks called clinkers. The incredibly spiny surface of a solidified ‘A’ā flow makes walking very difficult and slow.

Detailed explanation-3: -Highly viscous, rhyolitic magmas may produce explosive clouds of hot ash and gasses that evolve into buoyant plumes. Aa flows. A lava flow that has surfaces of rough jagged blocks with dangerously sharp edges and spiny projections. Pahoehoe flows.

Detailed explanation-4: -Some lava flows were very dense and have a surface of angular blocks referred to as block lava. Others have a rough, jagged, or clinkery surface called a’a lava. Still others have a smooth, ropy, or billowy surface called pahoehoe lava.

Detailed explanation-5: -Pahoehoe is lava that in solidified form is characterized by a smooth, billowy, or ropy surface, while aa is lava that has a rough, jagged, spiny, and generally clinkery surface. In thick aa flows, the rubbly surface of loose clinkers and blocks hides a massive, relatively dense interior.