A conditional statement has how many parts?

Blank is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer

In north america, most winter storms form when cold, dry air from interacts with warm, moist air from

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle