Chapter 14.1, Problem 3MI

Summary Introduction

To fill:

The correct terms in the given blanks to complete the sentence.

Introduction:

A biological events is a function perceived in a grouping of sedimentary rocks, where there is a huge change in the biota as recorded by arrays of fossils over short span.

Answer to Problem 3MI

The correct term is given in the table:

S. No.	Term
1.	Cambrian explosion
2.	Eon
3.	Epoch
4.	Era
5.	Periods
6.	fossil
7.	Geologic time scale
8.	Half-life
9.	K-T boundary
10.	Law of superposition
11.	Paleontologist
12.	Plate tectonics
13.	Radiometric dating
14.	Relative dating

Explanation of Solution

Scientists measure Earth's geological and biological events using the geologic time scale, which is divided into eon, epoch, eras and periods. The Cambrian explosion is the name of a period of rapid change during which the ancestors of most animal groups emerged. A layer of soot found between rock layers worldwide, known as the K-T boundary, might indicate that a large meteorite collided with Earth.

The theory of plate tectonics describes Earth's surface as large plates that move over Earth's thick, liquid interior. These plates are made up of various types of rocks. Paleontologists are scientists who study fossils. They determine the relative age of rocks using relative dating, which compares the sequence of rock layers. The law of superposition states that younger rock layers are deposited on top of older rock layers. Another method of determining the age of rocks is radiometric dating, which measures the decay of radioactive isotopes. The rate of decay can be measured using half-lives, the amount of time required for half of a radioactive isotope to decay.