The envelope of gas surrounding the earth is the

One of the main problems associated with mining is water pollution.

Answer the following statement true (T) or false (F)

What are the eight chemical elements that make up over 99% of Earth's crust? What will be an ideal response?

By the year 2050, the world needs to cut its greenhouse gas emissions by ____% in order to prevent the planet from heating up by more than 3.6o F (2o C).

A. 5-15 B. 15-25 C. 25-50 D. 50-85 E. 100

The Convention on Biological Diversity, ratified by 191 countries, seeks to reverse the global decline of biodiversity and share the benefits from the use of genetic resources. What has slowed this progress?

A. penalties too severe for violators B. harsh enforcement mechanisms C. the lack of ratification by the United States D. focusing on ecosystems rather than individuals E. consideration for the traditions of indigenous peoples