# How did the Hawaiian Islands form?

- Source: NOAA Ocean Facts (ocean-facts.noaa.gov), Public domain, NOAA National Ocean Service, Ocean Facts
- Reading level: Grade 5
- Subjects: Rocks and Earthquakes, Ocean, Science
- Topics: islands, hawaiian, form, plate, spot, formed
- Length: 169 words, about 1 min
- By: NOAA National Ocean Service
- Original: <https://oceanservice.noaa.gov/facts/hawaii.html>
- Page: <https://sprout.rootsofreason.org/r/noaa-ocean-facts/hawaii>
- Open in Sprouts: <https://sprout.rootsofreason.org/?read=noaa-ocean-facts/hawaii>

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The Hawaiian Islands were formed by volcanic activity.

The Earth’s outer crust is made up of a series of tectonic plates that move over the surface of the planet. In areas where the plates come together, sometimes volcanoes will form. Volcanoes can also form in the middle of a plate, where magma rises upward until it erupts on the seafloor, at what is called a “hot spot.”

The Hawaiian Islands were formed by such a hot spot occurring in the middle of the Pacific Plate. While the hot spot itself is fixed, the plate is moving. So, as the plate moved over the hot spot, the string of islands that make up the Hawaiian Island chain were formed.

The Hawaiian Islands form an archipelago that extends over a vast area of the North Pacific Ocean. The archipelago is made up of 132 islands, atolls, reefs, shallow banks, shoals, and seamounts stretching over 1,500 miles from the island of Hawaii in the southeast to Kure Atoll in the northwest.

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## Picture credits

- U.S. Geological Survey, Public domain (US government work) (<https://oceanservice.noaa.gov/facts/hawaii.html>)