In order that a train stop safely it'll always pass a signal showing yellow light

Blank liquids and gases exert a buoyant force on objects placed in them

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat