Daily News Lesson

SHOW ALL

Jan. 19, 2022, 1 a.m.

The science behind the Tonga volcanic eruption, tsunami

Sign up for NewsHour Classroom’s ready-to-go Daily News Lessons delivered to your inbox each morning. To receive NewsHour’s monthly education newsletter click here. Write us with any questions, concerns or lesson ideas at education@newshour.org .

Summary

The first satellite images of the Pacific nation of Tonga after Saturday's volcanic eruption emerged Tuesday. The photos show the islands coated in ash. Despite the violent explosion, the Tongan government has reported just three deaths. The status of two smaller islands in its chain is still unknown. John Yang takes a closer look at the science behind the volcano, its explosion and aftermath. Terms: Tsunami — potentially destructive waves caused by suddenly displaced ocean water, especially after a volcano or earthquake

Five Facts

  • Where is Tonga, and what disaster did the island face in the past week?
  • What were some of the impacts of the volcano?
  • How far away were the volcano's effects felt?
  • Who is interviewed in this piece, and what is his background?
  • Why might the eruption have been heard thousands of miles away in Alaska, even if this was a relatively small eruption as measured by the amount of material it generated?

Focus Questions

What were some of the aspects of this eruption that scientists didn't understand, according to this interview? How do you think they'll go about figuring out what they don't yet know? Media literacy: What aspects of the science of volcanoes do you think were explained well in this piece? What was unclear?

For More

For more on the science behind the violent explosion that accompanied the volcano, see this article .
Satellite view of the eruption of an underwater volcano off Tonga
The eruption of an underwater volcano off Tonga, which triggered a tsunami warning for several South Pacific island nations, is seen in an image from the NOAA GOES-West satellite taken at 05:00 GMT January 15, 2022. CIRA/NOAA/Handout via REUTERS THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. TPX IMAGES OF THE DAY
The eruption of an underwater volcano off Tonga, which triggered a tsunami warning for several South Pacific island nations, is seen in an image from the NOAA GOES-West satellite taken at 05:00 GMT January 15, 2022. CIRA/NOAA/Handout via REUTERS

Links

TRANSCRIPT

Recent Daily News Lessons

alzheimer-1024x576

Daily News Lesson

How the Mayo Clinic is using improv and music to engage dementia patients

Explore the idea of "music as medicine" and the research behind it

Screenshot 2026-08-26 at 1.04.41 PM

Daily News Lesson

New study reveals widespread signs of brain trauma among former NFL players

"...this is absolutely not a rare disease in the NFL population." — Dr. Chris Nowinski

FILE PHOTO: Parton performs on the Pyramid Stage at Worthy Farm in Somerset, during the Glastonbury Festival

Daily News Lesson

Remembering Dolly Parton, whose artistry and generosity touched generations

Parton's seven-decade career brought her international acclaim and adoration from fans drawn to her music, charisma and trademark wit

outage

Daily News Lesson

Indiana residents frustrated by extended power outage

Discuss why residents of northwest Indiana are unable to re-establish power many days after being hit by a powerful storm

SUPPORTED BY VIEWERS LIKE YOU. ADDITIONAL SUPPORT PROVIDED BY:

PBS News Hour Classroom

Copyright © 2025 News Hour Production LLC. All Rights Reserved

Illustrations by Annamaria Ward