Background information in rural areas in Northern cape​

Most famous for the diamond mines around Kimberley, the Northern Cape also has a substantial agricultural area around the Orange River, including most of South Africa's sultana vineyards. Climate Science. In general the Northern Cape is a hot and dry region with a climate similar to that of desert or semi-desert areas. The average annual rainfall varies considerably across the province ranging from 50 mm and 400 mm depending on location.

Explanation:

answer; gravity pulls glaciers down hill and as glaciers flow it pick up rocks and soil;