Problem 2
Earth is 4.6 billion years old. This number does not come from studying Earth rocks since Earth's oldest rocks only date to about 4 billion years. The number comes from studying lunar rocks and meteorites. Based on what you know about the formation of our solar system, how old do you think the other planets are? Why did you assign this age or these ages?
Problem 3
Why do geologists look to meteorites to tell us about the internal structure of Earth?
Problem 4
After entering a dark room, you turn on a wall switch but the light does not come on. Suggest at least three hypotheses that might explain this observation.
Problem 5
Each of the following statements may either be a hypothesis \((\mathrm{H}), \mathrm{a}\) theory \((T),\) or an observation \((\mathrm{O}) .\) Use one of these letters to identify each statement. Briefly explain each choice. a. A scientist proposes that a recently discovered ring-shaped structure is the remains of an ancient meteorite crater. b. The Redwall Formation in the Grand Canyon is composed primarily of limestone. c. Earth is composed of several large plates that move and interact with each other. d. Since \(1885,\) the terminus of Canada's Athabasca Glacier has receded 1.5 kilometers.
Problem 6
Consider the possible results of the following scenario and describe one positive and one negative feedback. Earth is getting warmer, consequently evaporation is increasing.
