This document outlines a lab assignment on relative and absolute age determination, focusing on problems related to radioactive decay and half-lives of isotopes like carbon-14, uranium-235, and potassium-argon. Students must determine the age of a fossilized bone and an igneous intrusion by analyzing the remaining percentages of these isotopes. The assignment consists of specific questions that guide students through calculations and relative dating of geological layers.

1. Relative and Absolute Age Determination Lab Assignment (40 marks) Part 1- Absolute Dating
Below are several problems based on radioactive decay. Use the hait-life of the necessary isotope
to complete the questions. Half-lives Carbonwelitrogen14 --5730 yrs Uranlumzasheadzar- 713
million yrs Potassiumad/Argonu- 1.3 billion yrs 1. A fossilized bone was found in a deep layer of
rock. Analysis of the bone showed 12.5% of the total Carbonis was left. Based on the amount of
Carbonis left in the bone, how old is the bone? (1 mark) 2. In the diagram below, there are 4
sedimentary units. The igneous intrusion (V) was dated. This rock had 25% of the overall
Uranium23s left in the composition of the rock. ( 2 marks) a) Using the amount of Uraniumzss left
in the intrusion, how old is the intrusion? b) What are the relative ages of the rock layers around
and beneath the intrusion?