GEOLOGY

Detailed explanation-1: -These type of volcanic islands get their name from the shape itself. They are not sharp, but can be rather massive. They are formed by lava that is fluid and flows easily. The shield is formed by the expanding lava.

Detailed explanation-2: -Volcanoes have a cone-shaped structure that has been built over long periods of geologic time after multiple eruptions. At the very top of this cone is a crater. All active volcanoes sit atop a plume of magma called a magma chamber.

Detailed explanation-3: -The caldera had a diameter of eight to ten kilometers (five to six miles). A collapse at this magnitude is large enough to induce multiple, intense high-magnitude earthquakes, according to researchers. In the process, the caldera gave the island its unusual horseshoe shape.

Detailed explanation-4: -Volcanoes are classified by the eruption type and by the volcanic cone shape. There are three basic cone shapes and six eruption types. The three cone shapes are cinder cones, shield cones, and composite cones or stratovolcanoes.

Detailed explanation-5: -Shield volcanoes, the third type of volcano, are built almost entirely of fluid lava flows. Flow after flow pours out in all directions from a central summit vent, or group of vents, building a broad, gently sloping cone of flat, domical shape, with a profile much like that of a warrior’s shield.