[REQUIRED] What are the two types of lava flows found at Hawai‘i Volcanoes National Park?

Question

BlackTom AI · Accepted Answer

The question asks about the two types of lava flows found at Hawai‘i Volcanoes National Park, so we should evaluate what each option claims and compare with well-known basaltic lava types.
Option 1: 'Pāhoehoe and ‘A‘ā'—these are the classic, widely recognized Hawaiian lava flow types. Pāhoehoe is smooth, billowy, or ropey on the surface and tends to form low-viscosity, easily moldable flows. ‘A‘ā is rough, jagged, and clinky, with a clinkery surface that forms as the lava breaks apart and advances more viscously. This option aligns with established volcanic geology in Hawaii.
Option 2: '‘A‘à and granite'—‘A‘ā is a lava flow type, but granite is an intrusive igneous rock with coarse crystals formed deep underground, not a lava flow type. Mixing a flow category with a rock type here is inaccurate for describing lava flows at the surface, so this pairing is incorrect.
Option 3: 'Pāhoehoe and felsic lava'—Pāhoehoe describes surface morphology, not a specific composition. While Hawaiian lava is typically low-viscosity basalt (mafic), calling it 'felsic lava' would imply a high silica content and higher viscosity, which does not characterize the common Hawaiian flows. Therefore this option misstates the lava composition concept.
Option 4: 'High viscosity olivine and feldspar'—This phrase seems to name minerals rather than a flow type. It implies a mineralological description rather than describing distinct lava-flow morphologies. Since the question targets flow types, this choice is not correct.
In summary, only the first option correctly names the two well-known surface lava-flow types associated with Hawai‘i—Pāhoehoe and ‘A‘ā—while the others mix incorrect pairings of concepts (rock type vs. flow type, or inappropriate mineral descriptors).

EARTHSC 1105 SP2025 (19395) UNIT 04 | Quiz

[REQUIRED] What are the two types of lava flows found at Hawai‘i Volcanoes National Park?

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