A Long-Standing Division in Yellowstone's Volcanic Record Questioned
In the app: the whole story at your level, listening, the quiz and the word cards.
The same story at six levels
How the first sentence reads at every level, from A1 to C2.
- A1
Scientists at Montana State University studied volcano rock.
- A2
Scientists at Montana State University studied the Lava Creek Tuff.
- B1
Since the 1960s, geologists have divided the Lava Creek Tuff into two separate units.
- B2
Since the 1960s, geologists have divided the Lava Creek Tuff into two separate units.
- C1
Since the 1960s, geologists have divided the Lava Creek Tuff into two separate units known as member A and member B. This deposit of volcanic material was left behind 631,000 years ago by the supereruption that formed Yellowstone Caldera.
- C2
For more than half a century, the geological map of the Lava Creek Tuff has rested on a tidy boundary.
Key words
Words from the B1 text, with their meaning.
- geologist
- a scientist who studies rocks and how the Earth was formed
- massive
- very large, heavy, and solid
- eruption
- an event when a volcano explodes and sends out hot rock, ash, and gas
- division
- the act of separating something into two or more parts
- examine
- to look at something very carefully in order to learn about it
- sample
- a small amount of something that is tested or looked at to see what the rest is like
Rewritten with AI from facts reported by USGS. Read the original for the full report.