Q: Answer the question

Which of these involves the formation of a new chemical substance?
OPTIONS:
- evaporation of gasoline
- mixing salt and pepper
- dissolving sugar in tea
- rusting of an iron chain

A: rusting of an iron chain

Q: Answer the question

A spring-fed stream forms a pond that contains watercress plants, minnows, and crayfish. The pond receives 5 hours of direct sunlight every day. Which of the following is an abiotic factor in this ecosystem?
OPTIONS:
- the pond water
- the watercress plants
- the minnows
- the crayfish

A: the pond water

Q: Answer the question

All of the processes listed below cause changes in Earth's surface. Which of the following is the slowest to change Earth's surface?
OPTIONS:
- earthquake activity
- landslide
- volcanic eruption
- weathering

A:
weathering