The first insect fossils are dated to the Devonian, but because of the development of the genetics, the scientists have been able to trace the appearance of the first insects in the Ordovician. The insects originated from the crustaceans. Initially they were walking on land, but they hadn't developed wings. The wings came to develop in some insects in the Devonian, and since than it has gradually became one of their trademark features. It is interesting that the first insects actually appeared at the same time with the first terrestrial plants, and also that they are the first organisms to develop wings and be able to fly.
Three conditions are necessary to form a glacier: (1) Cold local climate (polar latitudes or high elevation). (2) snow must be abundant; more snow must fall than melts, and (3) snow must not be removed by avalanches or wind
Traditional crops are still produced by traditional methods in many parts of the world by either tribals or the practice of various countries but this does not mean that they are resistant to pests or germs and infections to meet the requirements of millions of population on earth.
Man has thus created HYV seeds that are genetically robust and modified to suit the harsh environments with less irrigation these crops can produce good quality results and thus, the community at large has to turn towards the hybrid and strong crops.
So, as to adopt these and meet the growing demands of people in rural areas so as the increase in migration from rural to urban to rural areas can be decreased and climate change and other issues can be tackled more openly.
The latitude ranges form 0 to (+, -) 90 ° while the longitudes ranges form 0 to 180 degrees. The above given pairs are correct except the last one as first line of latitude and then longitude follows.
As the physical geographer, they identify them with the earth's natural resources and the human geographers are concerned with the man activities as a cultural environment and the environmental geography is the link between the land and man and is Central to the study of the earth as the home of man. All are subfields of geography.
