An example of an active shield volcano includes:

Question

BlackTom AI · Accepted Answer

Shield volcanoes have broad, gentle slopes built by low-viscosity, basaltic lava that can flow long distances; classic modern examples are the Hawaiian volcanoes (Mauna Loa, Mauna Kea, Kīlauea). These features and eruptive styles distinguish shield volcanoes from other volcano types.

Relevant concepts:
- Lava composition: Shield volcanoes erupt basaltic (low silica) lava that is fluid, producing widespread thin flows.
- Volcano profile: Gentle, wide slopes (often only a few degrees) rather than steep cones.
- Eruption style: Effusive (lava flows) rather than highly explosive.
- Activity: “Active” means recent or ongoing eruptions; Kīlauea and Mauna Loa on Hawaii have erupted in modern times.

Step-by-step reasoning applied to the choices:
1. Mt. Rainier — This is a stratovolcano (composite volcano) composed of alternating lava flows and pyroclastic material, with steeper slopes and more explosive potential; not a shield volcano.
2. Hawaii — The Hawaiian Islands are formed primarily by shield volcanoes (Mauna Loa, Mauna Kea, Kīlauea). Kīlauea and Mauna Loa are active in historical times (Kīlauea erupted continuously for decades; Mauna Loa erupted in 2022), so “Hawaii” fits both the shield-type and active criteria.
3. Mt. St. Helens — A classic stratovolcano known for the explosive 1980 eruption; steep, conical, and not a shield volcano.
4. Crater Lake — Crater Lake occupies the caldera of Mount Mazama, which was a stratovolcano that collapsed after a major explosive eruption ~7,700 years ago; the caldera/lake is not an active shield volcano.

Why the correct answer is correct:
Hawaii’s volcanoes match the key attributes: basaltic, low-viscosity lava producing broad, gentle slopes, and several Hawaiian volcanoes are currently active. The other options are stratovolcanoes or a caldera, differing in composition, shape, and eruption style.

Therefore, the correct choice is Hawaii, which matches the provided answer.

An example of an active shield volcano includes:单项选择题

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