What feature of the Andes Mountains made it a major challenge for the Incas to grow enough food?

The large number of active volcanoes

The steep, rocky slopes and thin soil

The lack of animals to help with farming

The dense forests covering the land

The Incan development of agricultural terraces was a direct response to which geographic problem?

Frequent earthquakes in the region

A lack of flat, open land for farming

Major rivers that often flooded their fields

Extremely cold weather at the mountain base

It used special fertilizer to make the mountain soil richer.

It involved building tall walls to protect crops from strong winds.

It created a series of wide, flat steps on steep hillsides for planting.

It channeled water from distant rainforests to the mountain peaks.