Chapter 2, Problem 1LR

The rock samples you encountered while completing this exercise are called hand samples because you can pick them up 10 your hand and study them You can also easily examine hand samples with a hand lens, test them for hardness and reactivity to HCl, and feel and heft them. However, some charactenstlcs of each rock group are so diagnostic that you can observe them at a distance and classify the rocks as Igneous, sedimentary, or metamorphic Examine the rock outcrops shown in Figure 2.23 and determine whether each is igneous, sedimentary. or metamorphic

Summary Introduction

Introduction:

The rocks are divided into three primary categories. These categories are sedimentary, igneous, and metamorphic rocks. The difference in these rocks lies in the process of formation of the rocks.

Answer to Problem 1LR

Correct answer:

The outcrop A depicts sedimentary rock, outcrop B is metamorphic rock, and outcrop C depicts igneous rocks.

Explanation of Solution

The three types of rocks are igneous rocks, sedimentary rocks, and metamorphic rocks. The igneous rocks are formed after the cooling and hardening of magma. The sedimentary rocks are formed from the aggregation of the sediments that is of different size and nature. The metamorphic rocks are formed under the process of metamorphosis that takes place under high temperature and pressure.