Author Question: Process of Science: Think about some ways in which we might figure out how old things are that last ... (Read 78 times)

ap345 · **on:** Jul 27, 2018

Process of Science: Think about some ways in which we might figure out how old things are that last for much longer than a human lifetime. What about for things that last longer than humans have existed?

What will be an ideal response?

Question 2

A planet with an albedo of 10 percent absorbs 10 percent of the sunlight that strikes it and reflects the other 90 percent.

Indicate whether the statement is true or false

Briannahope · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

For relatively recent events, we can look at the human historical record as written in books, painted on rocks, or just passed on orally from generation to generation. There are several such examples that pertain to astronomical phenomena such as comets and supernovae. In the case of events that happened before humans existed, we have to look at evidence in the Earth's geological record. An example is the iridium layer that suggests a massive explosion the spread ejecta around the globe. We can also use radioisotope dating where we use the known timescale for the decay of a radioactive element to measure the age of an object such as a meteorite.

Answer to Question 2

FALSE