2-4 Can we make it rain?

Fill in the blank: The air that surrounds a planet is called ________.

• atmosphere

• lithosphere

• hydrosphere

• biosphere

Fill in the blank: To heat a liquid until it bubbles and turns quickly into a gas is to ________.

• boil

• freeze

• melt

• condense

Fill in the blank: The process of a gas changing to a liquid is called ________.

• condensation

• evaporation

• sublimation

• melting

Fill in the blank: A set of events that repeats in the same order over and over is called a ________.

• cycle

• pattern

• sequence

• interval

Fill in the blank: The process of a liquid changing to a gas is called ________.

• evaporation

• condensation

• freezing

• sublimation

Fill in the blank: A test used to discover new information about a question is called an ________.

• experiment

• observation

• conclusion

• hypothesis

Fill in the blank: All the water (solid, liquid, gas) on and around planet Earth is called the ________.

• hydrosphere

• atmosphere

• lithosphere

• biosphere

Fill in the blank: A pretend version of something that scientists use when the real thing is too big, small, or complicated to work with is called a ________.

• model

• experiment

• theory

• diagram

Fill in the blank: To pay close attention to something is to ________.

• observe

• ignore

• forget

• neglect

Fill in the blank: Water falling from clouds in the sky, including rain, snow, and hail, is called ________.

• precipitation

• evaporation

• condensation

• transpiration