Which of the earth’s four spheres is made up of the gases that surround the earth, and is located at number 1 on the image above? a. the biosphere b. the lithosphere c. the atmosphere d. the hydrosphere

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

In the diagram below dab and dac are adjacent angles

In an effort to japan recover from the devastating effects of the 1929 depression, japanese military leaders in the 1930s formed an alliance with nazi germany negotiated more trade treaties with the soviet union closed its doors to western trade adopted a policy of imperialist expansion