ML5-PRAC Tidespeed 21NOV2013

ML5-PRAC_TideSpeed.docx 21NOV2013

Speed of the rising tide

Background: The graph below shows how the height of the tides in Penobscot Bay changes over the course of two days. Measurements were made every six minutes at a tide gauge in Rockland on April 15 and 16, 2012.

Question: In what places along the line graph does the tide rise the fastest?

1. Why is a line graph a good choice to show evidence to answer this question?

a. Because the graph shows how the tide height changes over the two days. b. Because the graph compares two numbers: the average height of high tide with the average height of low tide c. Because the graph shows how tide height and water temperature are correlated d. A line graph was a poor choice to answer this question

Please explain your reasoning.

2. Based on the evidence in the graph, how would you answer the question, When does the tide rise at the fastest speed?

Data file: DL_Tides and moon phases (Aug-Oct 2012)