amayita
1 Answer
ROMOS
Tephra is a general term for fragments of volcanic rock and lava regardless of size that are blasted into the air by explosions or carried upward by hot gases in eruption columns or lava fountains. Such fragments range in size from less than 2 mm (ash) to more than 1 m in diameter. Large-sized tephra typically falls back to the ground on or close to the volcano and progressively smaller fragments are carried away from the vent by wind. Volcanic ash, the smallest tephra fragments, can travel hundreds to thousands of kilometers downwind from a volcano.
Read more :http://volcanoes.usgs.gov/hazards/tephra/
| 11 years ago. Rating: 3 | |
Top contributors in Earth Sciences & Geology category
Unanswered Questions
Cuevana2 kim
Answers: 0
Views: 9
Rating: 0
go88jolieinnyc
Answers: 0
Views: 6
Rating: 0
iwinbetcom
Answers: 0
Views: 10
Rating: 0
GK888 – Nhà Cái Uy Tín, Thắng Lớn Mỗi Ngày
Answers: 0
Views: 9
Rating: 0
máy rửa xe
Answers: 0
Views: 12
Rating: 0
Cinecalidad help
Answers: 0
Views: 9
Rating: 0
Cinecalidad help
Answers: 0
Views: 9
Rating: 0
Cinecalidad help
> More questions...
Answers: 0
Views: 9
Rating: 0