In the United States, the Bureau of Labor Statistics computes the consumer price index which is used to find inflation rates. The bureau states that the consumer price index âis a measure of the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services.â.
The earth ulis called a blue planet because of the presence of abundance of water in it. About 70 percent of the earth's crust is covered with water. And this imparts it with a blue colour as seen from the space.
Earth is considered a closed system because though heat enters, its mass remains essentially constant. The matter of Earth remains on Earth and in its atmosphere because gravity prevents it from migrating into space. Earth is also considered to be more of an approximation of a closed system because some matter does enter from space.