Question

How do officials warn people about volcanic eruptions? Select the best answer from the choices below.

a.) People are warned to watch for an increase in earthquakes

b.)Scientists use tiltmeters to measure the angle of the volcano's slope and check for ground swelling

c.)The U.S. Geological Survey employs a nationwide volcano alert-level system

d.)Scientists measure gas emissions around a volcano

Answer 1

C

Step-by-step explanation:

The U.S Geological Survey employs a nationwide volcano alert-level system