The Sun is the sole source of light and heat for the maintenance of life on Earth. It is a star, a glowing ball of gas held together by its own gravity and powered by nuclear fusion at its center. In its physical and chemical properties, the Sun is very similar to most other stars, regardless of when and where they formed. Indeed, our Sun appears to lie right in the middle of the observed ranges of stellar mass, radius, brightness, and composition. Far from detracting from our interest in the Sun, this very mediocrity is one of the main reasons we study itwe can apply our knowledge of solar phenomena to so many other stars in the universe.
a. example
b. explanation c. definition
Question 2
Sociology is a systematic approach to thinking about, studying and understanding society, human social behavior, and social groups. It is different from other approaches to understanding human behavior in two key ways. First, it places its major emphasis on understanding the influences of social groups and the larger society on behavior. In this regard, it is different from psychology, for example, which primarily looks within the individual for explanations of human behavior. Second, sociology does not focus on certain specific areas of human behavior (as, for example, do political science and economics), but rather seeks to explain the broad range of human behavior as it is influenced by social groups and society.
a. explanation
b. cause-effect c. enumeration and definition
Surface magnetic field of SU Aur (a young star of T Tauri type), reconstructed by means of Zeeman-Do
The Sun as it appears from the surface of the Earth at sunrise.
Life cycle of moss
Shooting star
The Ku Klux Klan forces John Campbell, a black man, to beg for his life in Moore County, North Carol
How much heat energy in Joules is required to heat 16.0 g of copper from 23.0 °C