What information did geologists use to divide Earth's history into intervals? changes in climate

changes in the atmosphere

changes in the fossil record

changes in volcanic activity

Suggest two reasons why irrigation is important for human development of the desert

The graph below plots the temperature and luminosity of stars on the main sequence.

If we review the changes in the landscape surrounding the great salt lake in utah we can see a change in topography. look at the area to the south of the lake. what change has occurred during the last twenty-nine years? a) erosion of the hills b) an increase in marshland c) flooding of the area and the development of wetlands d) deposition of sediments and an increase in elevation