Question:
Electricity has many uses. Which device is designed to transform electrical energy into useful heat energy?
OPTIONS:
- a clock radio
- an electric stove
- an electric motor
- a battery charger
Answer:
an electric stove
Question:
Which statement is the best description of what happens in the rock cycle?
OPTIONS:
- Rocks on old mountains are gradually weathered away while mountain building and volcanism form new mountains.
- Once formed, rocks stay in place until rocks above them are weathered away, and they reach the surface.
- As sedimentary rocks are buried deep below other rocks, they are changed by heat and pressure, eventually return to the surface, and are weathered again.
- Younger sedimentary rocks are always deposited on top of older metamorphic or igneous rocks.
Answer:
As sedimentary rocks are buried deep below other rocks, they are changed by heat and pressure, eventually return to the surface, and are weathered again.
Question:
Which is an example of a chemical reaction?
OPTIONS:
- nails rusting
- glass melting
- sugar dissolving
- alcohol vaporizing
Answer:
nails rusting
Question:
Rhea is a moon of Saturn. Which of these facts about Rhea best indicates that it does not have a water cycle in which water changes state?
OPTIONS:
- Its radius is 765 km.
- Its density is about 1.3 kg/m3.
- Its period of rotation is about 4.5 Earth days.
- Its temperature is between -174°C and -220°C.
Answer:

Its temperature is between -174°C and -220°C.