Topic- Earth Geologic Time Scale
1. (5X1) + (13X5) + (9X4) +(11X11) / (7X10) + (3X3) =
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) =
7. (12X6) + (13X12) + (4X11) / (5X6) + (10X14) =
8. (7X3) + (12X10) / (9X3) + (4X3) =
9. (14X5) + (5X4) + (9X11) + (2X8) / (6X1) + (2X13) =
10. (9X8) + (12X3) + (10X2) / (7X7) + (10X1) =
11. (6X9) + (1X14) + (8X8) / (6X14) + (5X2) =
12. (11X8) + (5X8) + (9X13) / (7X2) + (8X1) =
13. (3X1) + (10X6) + (7X4) + (11X3) + (12X12)
W
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R
D
H
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CLUES ACROSS
1. The two major group of reptiles – diapsids
(rise to reptiles) and synapsid (rise to mammals) dominated this period.
2. Began 544 million years ago allowing shallow seas to cover the continents and marine invertebrates to fishes, amphibians and reptiles.
9. Spanned 56 million years first bird and dinosaurs diversity.
10. The ages of fishes and amphibians diversity.
11. The extinction of the dinosaurs.
12. The evolution of insects to giants. The evolution of first reptiles, tree and ferns.
CLUES DOWN
1. The era ranges from about 4.6 billion years ago when earth is form, to about 544 million years ago.
3. Known as the age of reptiles made up of three periods: triasssic, Jurassic and creataceous.
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.