Which of the following was developed by the maya civilization?
a. the compass
b. the alphabet
c. land maps
d. an accurate calendar

The correct answer is D. Accurate calendar.

Accurate calendar was developed by people of Maya.

It developed mathematics, calendar, architecture, astronomical system and art.

It also developed an area in Mexico southeastern, Belize and Guatemala and Sierra madre highlands.

In 750 BC Maya cities were developed and in 500 Bc the cities possessed architecture which are monumental.

not sure might be he acquired the entire oregon territory from great britain

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.