Briefly explain the importance of the geologic time scale. What will be an ideal response?


The geologic time scale is the result of work by many geologists worldwide who used fossils, the rock
record, and radiometric dating techniques to determine a chronology for the evolution of Earth and its
life through time.

Environmental & Atmospheric Sciences

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The composition of the core is:

a. peridotite. b. basalt. c. granite. d. iron. e. iron and nickel metal

Environmental & Atmospheric Sciences

In different specimens of the same mineral, the interfacial angles between crystal faces are ____

A)greater than 90 degrees B)less than 90 degrees C)identical D)always 180 degrees E)impossible to predict

Environmental & Atmospheric Sciences

What is the role of carbon dioxide (CO2) in weathering? Explain Equation (5.3)

What will be an ideal response?

Environmental & Atmospheric Sciences

The substance shown below is called cisplatin and is used in the treatment of testicular cancer. [Pt(NH3)2Cl2] Which of the following correctly describes this substance?

A) Both Cl and NH3 are ligands. B) The substance contains six coordinate covalent bonds. C) Pt obeys the 18-electron rule. D) All of the above are correct for this substance.

Environmental & Atmospheric Sciences