Answer:
Most liquid fuels in widespread use are derived from fossil fuels; however, there are several types, such as hydrogen fuel (for automotive uses), ethanol, and biodiesel, which are also categorized as a liquid fuel. Many liquid fuels play a primary role in transportation and the economy.
Answer:
Indus River Valley
Explanation:
Modern day Punjab and Sindh provinces were proven to be the Indus's two largest cities : Harappa and Mohenjo-daro
