Climate and Weather Air is everywhere. All around Earth is a sea of gases called the atmosphere. This sea of gases protects people from the harmful rays of the sun and provides them with oxygen to stay alive. In this chapter you will learn what air is, what makes up the different layers, of the Earth's atmosphere, what factors produce climate, what things affect weather and climate, and what the major world climate groups are. Population Today, with more than five billion people living on the Earth the study of population has become more important than ever before.
Geographers study how climate, land, water and vegetation influence where people live on the Earth.
In this chapter you will learn how a country's economy is linked to it's population growth, and how food supply, natural resource supply, migration and population have become major world issues. We will also learn where the most heavily populated areas of the world are today. Culture Many different groups of people live on Earth. Each group has its own traditions and customs, history, languages and religious beliefs and practices. Each culture has its own way of life, unique in its own way, and made to satisfy its needs.