 One of the most important activities of the geography is the man-environment interaction. So here the things which are related to the man and its the control environment. Like we have the best example of the desert environment where the climate is too harsh for living. It has less than 10 inches of annual rainfall. So this type of environment is not suitable for living. It has the activities regarding the things which are actually too difficult for the human. So the water is not available for drinking purpose. Even the agriculture is very scanty. The vegetable cover is not available there or absence of the vegetable cover. So this type of condition actually belongs to the desert environment. Now when we are discussing the man-environment interaction, it has four spheres for study. One belongs to the lithosphere, the second belongs to the atmosphere, third belongs to the hydrosphere and fourth one is biosphere. In lithosphere we are studying the things which are related to the crustal environment or things which are related to your continental areas. So this part of the world is 29% of the total land of the world. So it has different environment like some areas are covered with the mountains, some are lowlands, some are plateau areas, some are covered with desert areas, some are coastal environment. So this area belongs to the settlement of the different human things like the urban environment, the rural environment, the agricultural activities, the industrial activities. So this is very important part of the earth. Second belongs to the atmosphere. So this part of the earth is actually a life layer of the planet. It has some gases which are important for the living environment of the different lives like we have the oxygen gas, the hydrogen gas, the nitrogen gas. So these gases are very useful for different lives over the planet. So this actually life layer is like an envelope around the earth. Now the third most important area is the hydrosphere. This is 71% of total environment of the planet, it covers 71% of total area. So this part of the world is actually covered with major ocean, major water bodies, as well as the rivers, the surface water, the groundwater. Number four is actually the biosphere which actually the life layer of the planet. It includes the most important life, the human life. Why? Because of the suitability of the air, suitability of the environment. So that's why this life is present over the surface of the earth. Now when we are studying the man environment interaction, so here we are dealing with the mountain environment. So mountain is one of the area where we can use this type of landform for the mountain farming. In the northern area of Pakistan where we have the highest mountains of the world, the north, the northwestern and northeastern part of the Pakistan is covered with Himalaya, the Karakoram and the Hindukush. So this area is suitable for the mountain farming. So here we have vegetables, the fruits. So then this kind of environment is suitable for these type of productions. So that's why we have the things which are actually related to the control environment. So the particular type of environment have particular type of activities.