Calculate the force off earth's gravity on a spacecraft 12,800 km above the earth's surface if its mass is 1350 kg

What major factors play a role in global warming? 1. human activity and normal climate conditions 2. natural factors and human activity 3. normal climate conditions and abnormal human activities 4. abnormal human activities and natural factors

Describe the four major spheres of the earth system; identify the parts of the earth they each represent. explain what is meant by the "earth system."

Why do farmers in different regions use different farming techniques