GEOLOGY

Detailed explanation-1: -That’s because the viscous volcanic material doesn’t flow that far from where it is erupted, so it builds up in layers forming a cone-shaped volcano known as a stratovolcano.

Detailed explanation-2: -The most majestic of the volcanoes are composite volcanoes, also known as strato-volcanoes. Composite volcanoes are tall, symetrically shaped, with steep sides, sometimes rising 10, 000 feet high. They are built of alternating layers of lava flows, volcanic ash, and cinders.

Detailed explanation-3: -Shield volcanoes consist largely of thin lava flows, with minor pyroclastic (mainly ash) layers. Their subaerial (above sea-level) slopes are mostly 4-8 degrees, having steep-walled summit calderas and also pit craters (sinkholes) that are similar to calderas in form but much smaller.

Detailed explanation-4: -Shield volcanoes are usually basalt but can be constructed of mostly andesitic lava flows. Mauna Loa and Kīlauea erupt almost exclusively basaltic lavas.