2. India is located in the tropics and subtropics (sufficient heat); Tropical monsoon climate is dominant (abundant rain and heat); Ganges and other rivers

Flow (abundant irrigation water source); Ganges Plain and Deccan Plateau (flat terrain); The Ganges hit the plains,

Black cotton field in Deccan Plateau (soil fertilizer); Cultivated land area ranks first in Asia (extensive cultivated land)

3. As early as18th century, Britain exiled prisoners to Australia, developed pastures and introduced excellent merino sheep. /kloc-In the first half of the 9th century, Australia implemented the encouragement policy of "land for grazing". In southeastern Australia, the climate is warm and humid, and the soil is fertile. Farmers once competed with herders for land. /kloc-In the middle of the 0/9th century, people discovered gold mines, and herders went for gold one after another, and the pasture became cultivated land. Now Australia's agriculture has been commercialized and mechanized, and the export of wheat is close to half of that of wool.

Australia adheres to the mixed agricultural model of "soil-grass-livestock-city", and adopts measures such as enclosure grazing and rotation grazing to improve natural grassland into semi-artificial grassland, sow high-quality leguminous forage and fertilize it, thus improving forage yield and quality and maintaining forage balance. Farming operations are based on pasture and crop rotation, and crop management is relatively extensive. Murray-Darling Basin in the southeast is a typical wheat pastoral area.

The explanation of "great market demand": mixed agriculture enables farmers to arrange their time reasonably and carry out agricultural activities; This scientific agricultural production mode not only protects the environment, but also promotes agricultural development and increases farmers' income. Note that the question asked is "the main reason for the formation". At the beginning of this model, farmers' own income was considered, but the market was not considered. However, once formed, it has a lot to do with the market. Agricultural production can adjust the product structure at any time according to the market to maximize the benefits.