How the Earth Was Made
Name: _____________________
Date: _____________
Log #:
_____
1. Approximately _________ billion years ago the super continent
_______________ was formed. This supercontinent was basically
________________.
2. Approximately 700 million years ago there was a giant _______ __________
which wrapped the entire planet in ___________ that was __________ thick.
Temperatures reached _______ during this time.
3. An accumulation of __________________ under the ___________ caused a
great eruption ___________ million years ago.
4. Approximately 500 million years ago the Cambrian Explosion occurred. What was
the result of this explosion?
5. Approximately 250 million years ago the _______________ ____________
_________________ occurred as a result of a ________________
___________ eruption. This caused _________ percent of life to be driven to
extinction.
6. As a result of this eruption _________________ emerged.
7. What species emerged on Earth shortly after this explosion, 230 million years
ago?
8. Pangea began to break apart approximately _________ million years ago as a
result of ________________. This also brought __________________ to
Earth from the mouths of ancient ______________.
9. All seven current continents were in place around _________ million years ago
with dinosaurs roaming on each of them.
10. Approximately ______ million years ago _____ % of all species went extinct due
to violent events.
11. One of those violent events may have been the discovery of about 2000 tons of
_____________, found in space rock, in the ________________ layer - the
layer of Earth upon which ______________ ______________ are found. A
________________ hole was found in Mexico in 1990 that dates back to
________________ million years ago. Other violent events may have included
volcanic eruptions with ____________ ___________ that could bury the US in
_______ feet of lava. Toxic ____________ and ash from the volcano may have
blocked out the _______. The combination of these events would have been
____________.
12. Approximately 15 million years later, or _________ million years ago, life was
recovering.
13. Canyons and mountain building were the result of ________________ or
_________________. The ________________ is a result of plate collision and
contains the ____________________ plate at the tip and the
_____________________ plate underneath. The ___________________ is
the result of an uplift of the Colorado Plateau (the ____________ plate and the
__________ _____________ plate) and the winding Colorado River.
14. Approximately _______ million years ago the first ancestor to modern-day
____ are in Eastern _____________. This also marks the beginning of the
________ _______ which was triggered by the _________ ____________ that
altered sea movement thus changing the climate. Evidence of this period can be seen
in New York’s ___________ ___________.
15. Starting at ________ thousand years ago ____________________ &
_________________ have taken over Earth
16. What will be the first major challenge this group will have to conquer?
17. It is estimated that ______ thousand years from now Earth will experience its
next ______ _______. As a result of the continually moving plates
_______________ ______________ could form ________ million years from
now. By _____ billion years from now it is possible Earth will be a barren
___________ _________ ______________.