How often does an el ni o event occur?
a. about every other year
b. every 10 years
c. about every 2 to 3 years
d. about every 3 to 7 years

The physical processes that create most of earth's physical features, including mountains, are known as

Which statement about factories in the industrial revolution is not true? a) some of the first advances were in textile mills b) spinning machines used water power c) water power was replaced by steam power d) coal was imported to english factories for power answer d) coal was imported to english factories for power

Select the natural regions. delta denver forest georgia north america plateau stream