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The great majority of asphalt used commercially is obtained from petroleum. Nonetheless, large amounts of asphalt occur in concentrated form in nature. Naturally occurring deposits of asphalt/bitumen are formed from the remains of ancient, microscopic algae (diatoms) and other once-living things. These remains were deposited in the mud on the bottom of the ocean or lake where the organisms lived. Under the heat (above 50 C) and pressure of burial deep in the earth, the remains were transformed into materials such as asphalt/bitumen, kerogen, or petroleum.

From where does most asphalt come?
Answer: petroleum
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Shortly before 312 BCE, the Plebeian Council enacted the Plebiscitum Ovinium. During the early republic, only consuls could appoint new senators. This initiative, however, transferred this power to the censors. It also required the censor to appoint any newly elected magistrate to the senate. By this point, plebeians were already holding a significant number of magisterial offices. Thus, the number of plebeian senators probably increased quickly. However, it remained difficult for a plebeian to enter the senate if he was not from a well-known political family, as a new patrician-like plebeian aristocracy emerged. The old nobility existed through the force of law, because only patricians were allowed to stand for high office. The new nobility existed due to the organization of society. As such, only a revolution could overthrow this new structure.

Who had already held a large amount of magisterial offices?
Answer: plebeians
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John's first wife, Isabel, Countess of Gloucester, was released from imprisonment in 1214; she remarried twice, and died in 1217. John's second wife, Isabella of Angouleme, left England for Angouleme soon after the king's death; she became a powerful regional leader, but largely abandoned the children she had had by John. John had five legitimate children, all by Isabella. His eldest son, Henry III, ruled as king for the majority of the 13th century. Richard became a noted European leader and ultimately the King of the Romans in the Holy Roman Empire. Joan married Alexander II of Scotland to become his queen consort. Isabella married the Holy Roman Emperor Frederick II. His youngest daughter, Eleanor, married William Marshal's son, also called William, and later the famous English rebel Simon de Montfort. John had a number of illegitimate children by various mistresses, including nine sons Richard, Oliver, John, Geoffrey, Henry, Osbert Gifford, Eudes, Bartholomew and probably Philip and three daughters Joan, Maud and probably Isabel. Of these, Joan became the most famous, marrying Prince Llywelyn the Great of Wales.

Who did Joan marry to become queen consort?
Answer:
Alexander II of Scotland