Question

Which of the following are early clues that signal an earthquake may occur? Select all that apply. Changes in magnetic properties of rock Movement of magma Decrease in well water levels Increase in sulfur dioxide and carbon dioxide ground emissions Increases in radon gas in groundwater Foreshocks

Answer 1

correct order for early clues that notify about earthquake is:

`\rightarrow` change in magnetic properties of rock

`\rightarrow` Decrease in water levels in well

`\rightarrow` increase in the amount of radon gas in subsurface water foreshocks

Step-by-step explanation:

correct order for early clues that notify about earthquake is:

`\rightarrow` change in magnetic properties of rock

`\rightarrow` Decrease in water levels in well

`\rightarrow` increase in the amount of radon gas in subsurface water foreshocks

The other that can take place the position of clues for volcanic eruption are

`\rightarrow` Movement of magma

`\rightarrow` increase in SO_2 and CO_2 emission from grounds

Answer 2

The following answers apply;

• Changes in magnetic properties of rock
• Decrease in well water levels
• Increases in radon gas in groundwater
• Foreshocks

These other choices may be good indicators of an imminent volcanic eruption;

Movement of magma

Increase in sulfur dioxide and carbon dioxide ground emissions