Short Answers Flashcards
I will describe how geoligists detriment relative age of rocks
Geoligist detrimine the relative age if rocks using many different techniques they may use law of superstition or radioactive dating
I will explain how fossils form and identify the different kinds of fossils
There are many ways fossils form most firm when living things die and are buddies by sediment then the sediment hardens slowly into a rock and are preserved in the shape of the organism different kinda of fossil include Trace and index fossils
U will explain what happens during radioactive dating and how scientists detrime the age of the earth
When using radioactive dating scientists first determine the amount of a radioactive element in the rock then they compare that amount with the amount of the stable element into which the radioactive element decay
I will explain how earth has evolved over geologic time
Earth has evolved by weathering erosion and plate techtoniques
Compare and contrast molds cast and trace fossils
They are all alike because they are all different types of fossils but they are different because they all show different things and all look different
What can scientists learn from studying fossils
They can learn many different things starting off with the age of earth they can learn the age of earth by using radioactive dating to figure the age of rocks , they can also figure out ancient organisms that once lived on earth
What are index fossils
An index fossil must be widely distributed and represent an organism that existed for a geologically short period of time they are useful because they tell the relative ages of rock layers in which they occur
How have scientist concluded how old earth is
Scientists used earth samples and moon rocks and tested them using radioactive dating to conclude that the earth is about 4.6 billion years old
