Skip to content
Prep
Freely
Home
TOEFL
IELTS
Guides
Log in
Sign up
P
Account
Profile
My progress
Settings
Log out
TOEFL
/
Listening practice
/ Section PM25
Listen to an Academic Talk
Listen to part of a talk in a geology class.
Listen
28. Why does the speaker say the dangerous volcanoes are those that erupt rarely?
A
Rare eruptions are harder to predict with instruments.
B
Long quiet periods allow the explosive kind of magma to build up.
C
People stop taking precautions when nothing happens for years.
D
Volcanoes that erupt often release their silica gradually.