Question

According to the selection, which of the two following are the first signs that a tornado is starting to form

Answer 1

A dark, often greenish sky

Before a tornado strikes, the wind may die down and the air may become very still.

A loud roar similar to a freight train may be heard.

Step-by-step explanation:

Answer 2

Before a tornado strikes, the wind may die down and the air may become very still. A loud roar similar to a freight train may be heard. An approaching cloud of debris, even if a funnel is not visible.