The 4 Important Dates Yet Again Worksheet Answers Earth Science

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Fourth dimension Clocks

An exercise assembled by Dr. Stephen Greb, Kentucky Geological Survey to demonstrate changes in the Globe through time, and the length of time information technology took to brand many of the changes.

Materials

• A wall clock or lookout
• Paper, colored pencils or crayons, or other materials to draw or brand costumes of ancient animals and plants

Activity

Although fourth dimension lines are traditionally demonstrated with adding car paper, why not demonstrate time with fourth dimension? You can demonstrate changes in Earth history through time using the clock in your classroom. Time conversions for of import dates in Earth history are shown here for 1 hour (a typical course period). To show iv.half dozen billion years in one hr, (the age of the World) each minute equals 76.7 million years, and each second equals 1.3 million years.

Click hither to get gif image of above clock that can be printed at page size.

A list of Important Dates in Earth History is provided that contains the dates of the events shown on the time clock, and more than. The teacher can pick events from the list of key events and summate, or take students calculate the time for the fundamental events you wish to employ.

To calculate the time of an event when you lot are going to show 4.half dozen billion years in one hour:

Event (millions of years ago) / 76.vii = minutes agone the result occurred

The number calculated volition show the minutes from the end of the hour at which the event occurred. You volition usually desire to calculate the minutes from the beginning of the hour.

60 - minutes ago = minutes from the beginning of the 60 minutes. The minutes volition be in decimal form. For accuracy, if you wish to calculate seconds from the decimal number (this will exist of import when you get to man's place in Earth history):

decimal part of the number x 60 = number of seconds.

Example:  The Cretaceous extinction occurred 65 million years ago.           65/76.7=0.847         60 - 0.874 = 59.153 minutes past the hr         0.153 x 60 = 9.18 (round this off to ix seconds)         The Cretaceous extinction occurs at 59:09 later the hour.        

Once the dates yous wish to use have been converted to fourth dimension, yous can determine how you want to present those dates to your class.

(1) The teacher can simply tell the class that in the next hour they are going to be calling out events in fourth dimension to give the students a sense of how long it took to get to where the class is today. This can be done equally a backdrop to whatsoever else the grade is working on that day.

(two) The teacher can make the entire lesson about World history. This takes a little flake of timing, but yous can talk about each segment of World history as information technology happens. In the first office of class, discuss how the Earth formed, define a cell, the requirements for life, etc. Then get ready to speed up in the last 10 minutes of class every bit you discuss the development of fish to amphibians to reptiles to birds and mammals, etc.

(three) To make the time clocks exciting for the students, the teacher can assign each an Important Date in Globe History a day or two before the class. Let each student go to the library or provide information near the key date so that they tin can describe a picture, brand a mask, or write a short composition about their key issue. For example, if a student was assigned blue-light-green algae, they might say "I'yard blue-greenish algae, not much more than than slime, but I ruled the World for a very long fourth dimension!" For a mask they might brand a headdress that looked like ocean weed, or drapery themselves in green streamers. This volition let each student use their own inventiveness to illustrate the concept of changes in fourth dimension.

Because most of the life forms on Globe have been on the planet for simply the last 570 million years (the last 10 minutes of course), at that place won't be much fourth dimension to demonstrate the changes that have led to the children being in the class room that day. Yous can try to have the students representing primal events in the last 570 million years shout out their topics, merely in that location may be less than a infinitesimal between fundamental events in the last 5 minutes of grade., and this may require some dramatic orchestration. To better demonstrate the changes since the beginning of the Paleozic Era, do the same exercise the second mean solar day of form, using but the last 570 1000000 years of fourth dimension.

Click here to get gif epitome of above clock that can be printed at folio size.

To show 570 meg years in one hr, each minute equals 9.5 million years, and each second equals 158 m years. You tin option events from the Of import Dates in World History list and calculate, or have students calculate the time for their upshot as above.

To calculate the time of an result when you are going to bear witness 570 million years in one hour:

Result (millions of years ago) / 9.5 = minutes ago the event occurred

The number calculated will show the minutes from the terminate of the hour at which the outcome occurred. You will usually want to calculate the minutes from the beginning of the hour.

60 - minutes ago = minutes from the beginning of the hour. The minutes will be in decimal form. For accurateness, if you wish to calculate seconds from the decimal number (this volition be of import when y'all get to human being's identify in Earth history):

decimal part of the number 10 sixty = number of seconds.

Example:  The Cretaceous extinction occurred 65 meg years agone.           65/nine.5=vi.84         60 - 6.84 = 53.16 minutes by the hour         0.16 ten threescore = nine.vi (round this off to 10 seconds)         The Cretaceous extinction occurs at 53:10 after the hour.        

If you want to show your classes work to the globe, see Kentucky Kids Dig World Scientific discipline.

Get to Images in Time for pictures of ancient creatures
Become to Primal Links in Earth History for more info and images about earth history

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Source: https://www.uky.edu/KGS/education/clockstime.htm

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