Fact 1: High pressure systems cause clear weather.

Fact 2: Weather Clear weather usually means good visibility.

Given the two facts above, answer the question "High pressure systems can cause what?" with the following options: 
- global warming
 - hyperthyroidism
 - Dehydration
 - Greenhouse gases
 - symptoms
 - flooding
 - good visibility
 - harmful substances


 

       good visibility  