Activity Answers
Broadcast 4


Weekly Weather Log
Each week please complete the following information for both our location here off the coast of Australia and the location at your school. Each week students should complete the weekly log with the weather information at their school. Mrs. Linsley will send the ship weather report by email following each broadcast. Students can record this information at that time. Also, the front page of the web site will always display the time and date in Australia.

  My School Ship in Australia

Temperature

*
26°C

Day and Time

*
February 7, 2001 @ 10:00am
Precipitation
[indicate snow, sleet or rain]
*
None (but rough weather, Force 7 on the Beaufort Scale, 10-12 foot swells)
Skies or Cloud Bank
*
3/8
Season
*
High Summer
Wind Speed and Direction
*
26-30 Knots, S.E.


Formula for Converting Celsius to Fahrenheit:
F= (1.8 X C) +32
C=F-32/1.8

1 Knot = 1 nautical mile per hour (1 nautical mile = 6076 feet or 1852 meters)

Cloud Cover is recorded by a code which lists the coverage in eights:
Code:Eights
0:0
1:1/8 or less
2:2/8
3:3/8
4:4/8
5:5/8
6:6/8
7:7/8
8:8/8 Overcast
9: obscured or cloud amount cannot be determined

Questions/Activities
[Complete the questions below prior to the broadcasts, if at all possible]

1. Why do you think fossils are useful in finding ages of sediments?
Fossils are useful for two important reasons:
1) they are found in many rocks and sediments in many locations around the world. Because they are widespread and have fixed periods of time in which the organisms lived, they are the most commonly used tool for identifying the ages of sediments and sedimentary rocks. Other age-dating tools, such as radiometric dating (absolute ages) cannot be used as often as fossils because of the lack of appropriate minerals to analyze with these methods;
2) Fossils are the remains of organisms that lived for a finite period of time in the Earth's history. Finding a group (assemblage) of fossils together in one layer of rock allows us to use their overlapping age ranges to identify an approximate time that the rock was created. If two rocks (one from Africa and one from South America, for example) have the same combinations of fossils within them, then they were likely formed around the same time. By using a combination of the life spans of particular fossils, it is possible to identify an approximate time that the rock was created.

Return to the Broadcast Schedule