Q: Discarded electronic devices, such as outdated computers and cell phones, contain materials that can be toxic to the environment. Which statement best explains why humans continue to use these technologies?

OPTIONS:
- Electronics have become less expensive over time.
- Some areas have recycling programs for electronics.
- Industries that produce electronics help the economy.
- Humans value the benefits of these devices over their cost.
A: Humans value the benefits of these devices over their cost.
Q: Which of these processes is a conversion made by solar panels?

OPTIONS:
- mechanical energy to nuclear energy
- thermal energy to chemical energy
- kinetic energy to potential energy
- radiant energy to electrical energy
A: radiant energy to electrical energy
Q: Rocks in warm and humid environments can be weathered faster than rocks in other environments. Which is most likely the next step in the rock cycle for weathered rocks?

OPTIONS:
- They are cemented.
- They are compacted.
- They become eroded.
- They become molted.
A: They become eroded.
Q: Planting legumes in order to add nitrogen to soil most likely causes

OPTIONS:
- a decrease in the amount of acid rain.
- an enrichment in the fertility of the soil.
- an increase in the ratio of nitrogen to oxygen in the system.
- a reduction in the soil's ability to manufacture its own nitrogen.
A:
an enrichment in the fertility of the soil.