What are some examples of the influence of the Catholic Church during
the Middle Ages?

The church even confirmed kings on their throne giving them the divine right to rule. The Catholic Church became very rich and powerful during the Middle Ages. People gave the church 1/10th of their earnings in tithes. They also paid the church for various sacraments such as baptism, marriage, and communion.

Church leaders ran schools and hospitals. Monks and nuns provided food and shelter for travelers. Priests recorded births, married people, and performed burial services. The church played a role in politics.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.