| a. Define the word hydrocarbon?  | A compound containing only hydrogen and carbon | 
| b. Crude oil is made mixture of many hydrocarbon | crude oil is made of many hydrocarbon | 
| c. What is crude oil made from? |  bodies of tiny sea creatures and plants and plankton that died  | 
| d. How long does it take to make? |  150 million years | 
| e. Where does the energy originally come from? |  the Sun | 
| f. How is crude oil different from coal? |  crude oil was formed from tiny animals and plants which lived in the sea, whereas choal came from trees and ferns that died and were buried beaneath the swamps | 
| g. Crude oil, coal and natural gas are collectively known as _________ fuels |  fossil | 
| h. How is crude oil transported when it is extracted from the ground? | By pipeline or oil tanker | 
 
5.6 please answer a) and b)
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