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ES-237 TEST IS TOMORROW!!

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ES-237 TEST IS TOMORROW!! Review on geologic time List the 4 eras in order (start with the youngest on top) Place the events in each era. Birds Plants Oxygen ... – PowerPoint PPT presentation

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Title: ES-237 TEST IS TOMORROW!!


1
ES-237TEST IS TOMORROW!!
  • Review on geologic time

2
  • List the 4 eras in order (start with the youngest
    on top)
  • Place the events in each era.
  • Birds
  • Plants
  • Oxygen
  • Dinosaurs
  • Horses/elephants
  • Cambrian Explosion

3
Try these conversions- You must show your work!
  • 345 mm _____ m
  • 2. 7,500 cm ____ m
  • 3. 76 km ____ m

4
Percents
  • Sponges first appeared 600,000 years ago. What
    percent of the Earths history have they been
    around?
  • 33 out of 50 students are wearing jeans. What
    percent is this?
  • You get 23 points out of 27 points on a test.
    What is your percent correct?
  • Write 1/16 as a decimal and a percent.

5
½ life
  • 1. If you start with 300 g of a radioactive
    element, how many grams will be left after 3
    half-lives?
  •  
  • 2. What percent of the original element is left
    after 3 half-lives?
  •  
  • 3. If you have 1000 grams of a radioactive atom
    that has a half-life of 4 minutes how much of the
    original element will remain after16 minutes?

6
  • 1. Which rock is
  • the oldest?
  • 2. Youngest?
  • 3. Is the basalt dike older or younger than the
    sandstone layer?
  • 4. Conglomerate layer?

7
  • A scientist who studies fossils is a ___.
  • PALEONTOLOGIST
  • Nests, tracks, droppings and bite marks are
    examples of ____.
  • TRACE FOSSILS
  • All fossils form in ____ rock
  • SEDIMENTARY
  • What type of dating is used to date fairly young
    fossils of once living things?
  • CARBON-14
  • Atoms are radioactive because their nuclei are
    ____.
  • UNSTABLE

8
When is the test????
  • Tomorrow,
  • Thursday, January 24!
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