Day 27

1
Day 27
What do numeric time scales show?
Numeric time scales use numbers to show how many
years ago different things happened.
What do proportional time scales show?
Proportional time scales show how different parts
of Earths history compare to the whole.
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Personal Time Line(Part 2)
Investigation 6 It's About Time
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Age of Earth

• Geologists and astronomers have determined that
  Earth came into existence about 4.5 billion years
  ago
• That's the same as 4,500,000,000 years ago.

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Time lines

• Proportional time scales show how different parts
  of Earths history compare to the whole of
  Earths history.
• Numerical time lines show the number of myas
  that events occurred.
• Time lines start with today and work backward.
• The Earth is 4.5 billion years old.
• Humans are very RECENT to Earth's history.
• Earth history is divided into Eras and further
  into periods.

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Activity

• You will now complete a personal history, make a
  timeline and answer questions about timelines.
• Complete page 45 with info about YOUR life.
• You will answer the questions from page 46 and
  follow the directions. You will make your
  timeline on the back of page 49. FOLLOW the
  DIRECTIONS!
• Complete page 49.