Q: Answer the question

A star is a celestial object that produces its own heat and light. Which of these celestial objects is the closest star to Earth?
OPTIONS:
- Mars
- Venus
- the sun
- the moon

A: the sun

Q: Answer the question

Earthworms move randomly throughout topsoil. How do earthworms most likely affect the topsoil?
OPTIONS:
- by compacting the topsoil
- by decreasing the fertility of the topsoil
- by adding nutrients to the topsoil
- by removing the minerals from the topsoil

A: by adding nutrients to the topsoil

Q: Answer the question

A student adds water and detergent to a cup of soil. The mixture is shaken and allowed to settle. The student observes that silt particles stay suspended long after the other particles form layers at the bottom of the jar. The most likely explanation is that the silt particles are
OPTIONS:
- organic.
- dissolving.
- less dense.
- moving faster.

A:
less dense.