I am gonna say that the answer for this one is 50% of water is not accessible easily.
Oil shale<span> is a type of </span>sedimentary rock<span> that is rich in kerogen. </span>Kerogen<span> is a part of rock that breaks down and releases hydrocarbons when heated. </span>Hydrocarbon<span>s are substances made entirely of hydrogen and carbon. </span>Petroleum<span> and </span>natural gas<span> are probably the most familiar hydrocarbons. The hydrocarbons in oil shale can be used as an alternative to petroleum or natural gas.</span>
Answer:
D. Plastic sheeting, ultraviolet lights, dams, mechanical equipment and pesticides
Explanation:
The agriculture has changed significantly in the past couple of centuries. With the start of the industrial revolution, the agriculture was gaining more and more products and technologies to make it make easier for working, safer from pests, providing artificial conditions for the plants, and having higher quality and quantity. The mechanical equipment made the work much easier, cheaper, quicker, and more efficient, replacing lot of labor force. The pesticides have contributed to minimizing the effects of the pests. The dams are providing water for the plants where there's not enough in certain periods of the year. The plastic sheeting manages to stop weeds from growing, keeping higher temperature and moist for the plants, making them grow better and quicker. Some plants do not receive enough sunlight, or have to grown in regulated conditions, so the ultraviolet lights provide the needed light for them to prosper and perform photosynthesis.
Answer:
Economic activities - The activity of making, providing, purchasing, or selling goods or services.
Commercial activities - An activity intended for exchange in the market to earn an economic profit.
