Which of the following is an observation and not an inference?
a.
a cup with steam coming from it will be hot to the touch.
b.
dark clouds in the sky will mean rain later in the afternoon.
c.
bubbles form when two chemicals are mixed together.
d.
a plastic bag moving along the ground is being pushed by the wind.

Which describes how weathering and erosion are different? weathering is caused by water. erosion is caused by wind and ice. erosion transports sediments. weathering is a natural process.

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

Were does condensation occur? a) hydroshereb) lithosherec) boishered) atmosphere