GEOLOGY

Detailed explanation-1: -Hazard aspects of shield volcanoes include lava flows, near-source ballistics and pyroclasts, phreatomagmatic explosions, and degassing.

Detailed explanation-2: -A volcanic hazard refers to any potentially dangerous volcanic process that puts human lives, livelihoods or infrastructure at risk of harm. Several hazards may affect the area around the volcano, such as lava flows, pyroclastic flows, lahars, jökulhlaups and landslides or debris avalanches.

Detailed explanation-3: -The primary hazards include pyroclastic flows, air-fall tephra, lava flows and volcanic gases. The secondary hazards include ground deformation, lahars (mudflows), landslides and possibly tsunamis in ocean floor volcanic eruptions.

Detailed explanation-4: -Volcanoes spew hot, dangerous gases, ash, lava, and rock that are powerfully destructive. People have died from volcanic blasts. Volcanic eruptions can result in additional threats to health, such as floods, mudslides, power outages, drinking water contamination, and wildfires.

Detailed explanation-5: -Lava flows are the greatest hazard of volcanoes. The Columbia River basalts and the plateau they form are sourced in the adjacent Cascade Range volcanoes. Yellowstone National Park was formed as a result of the eruption of a series of supervolcanoes. The chemical composition of all lavas is the same.