# GEOLOGIC TIME SCALE

```Topic- Earth Geologic Time Scale : Solve the following item
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Objective: 1. Interpret the geologic time scale the history of the earth.
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1. (5X1) + (13X5) + (9X4) +(11X11) / (7X10) + (3X3) =
CLUES ACROSS
CLUES DOWN
1. The two major group of reptiles – diapsids
(rise to reptiles) and synapsid (rise to
mammals) dominated this period.
1. The era ranges from about 4.6 billion years
ago when earth is form, to about 544 million
years ago.
2. Began 544 million years ago allowing
shallow seas to cover the continents and
marine invertebrates to fishes, amphibians
and reptiles.
3. Known as the age of reptiles made up of three
periods: triasssic, Jurassic and creataceous.
2. (12X14) + (8X7) + (13X2) / 9X12=
3. (11X5) + (7X2) + (6X11) / 14X7 =
4. (10X3) + (13X8) + (6X11) / 7X5 =
5. (1X12) + (4X13) / (1X9) + (6X3) =
6. (8X4) + (4X2) + (13X10) / (6X7) + (10X10) =
9. Spanned 56 million years first bird and
dinosaurs diversity.
7. (12X6) + (13X12) + (4X11) / (5X6) + (10X14) =
10. The ages of fishes and amphibians
diversity.
8. (7X3) + (12X10) / (9X3) + (4X3) =
11. The extinction of the dinosaurs.
9. (14X5) + (5X4) + (9X11) + (2X8) / (6X1) + (2X13) =
12. The evolution of insects to giants. The
evolution of first reptiles, tree and ferns.
10. (9X8) + (12X3) + (10X2) / (7X7) + (10X1) =
11. (6X9) + (1X14) + (8X8) / (6X14) + (5X2) =
12. (11X8) + (5X8) + (9X13) / (7X2) + (8X1) =
13. (3X1) + (10X6) + (7X4) + (11X3) + (12X12)
4. Known as the age of mammals because
mammals replaces reptiles as the dominant land
animals.
5. Originated 252.17 to 201.3 million years ago
Dinosaurs begin to appear, having evolved from
reptiles called Archosaurs.
6. The “time of ancient life” This period lasted
about 53 million years and marked a dramatic
burst of evolutionary changes in life on Earth,
7. Began 443 million to 416 million years ago
Coral reefs made their first appearance during
this time, the earliest terrestrial plants (vascular
plant).
8. Began 485.4 million years ago, Period marks
of the earliest appearance of vertebrates.
```
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