What causes good visibility?
permineralization focusing a lens high pressure systems flashlights peachleaf willow the Great Barrier Reef an electron microscope windpower operated machines
A B C D E F G H
Weather Clear weather usually means good visibility.
High pressure systems cause good visibility.
What causes good visibility? (A) permineralization (B) focusing a lens (C) high pressure systems (D) flashlights (E) peachleaf willow (F) the Great Barrier Reef (G) an electron microscope (H) windpower operated machines