Download Warm-Up # 56 Seafloor spreading - East Hanover Township School

WARM-UP # 52
What is ONE piece of evidence
that the continents were once all
joined together?
You know two – fit together like a puzzle
and matching fossil evidence.
WARM Up # 53
Who proposed the theory of
continental drift?
Alfred Wegener
proposed the
theory of
continental drift
in 1912. He was a
German scientist.
Warm-Up # 54
What is the theory of seafloor spreading
and what scientist developed this theory?
Scientists found that the youngest rocks
are located at the mid-ocean ridges. It
was discovered by Henry Hess.
Warm-Up # 55
Label the three major layers of earth on this diagram:
Warm-Up # 56
What are the two theories that when combined
make up the theory of plate tectonics?
Seafloor spreading (Hess)
and continental drift
(Wegner)
Warm-Up # 57
A. What theory of explains why the seafloor has
both trenches and mid-ocean ridges?
Seafloor spreading
B. Evidence that tectonic plates are being created
at divergent boundaries is that younger
_______ rocks
are found at the mid-ocean ridges and
older
______________rocks
are found further away.
C. What is the name of the one large
supercontinent that existed millions of years
ago? Pangea
Warm-Up # 58
What is the name of the
most famous transform
fault (plate boundary) in
the world?
San Andreas
Where is it?
California
What is a transform
fault?
A plate boundary where
the plates grind past each
other (not toward or away
from each other).
Warm-Up # 59
What is hot, melted rock
under the surface of the
Earth known as???
MAGMA. Hot, melted
rock on the surface of
Earth is known as
LAVA
Warm-Up # 60
What are climate
clues????
Wegner found fossils of the same organism
but in very different climates – like a tropical
plant in a polar region or a glacial (glacier)
deposit in a tropical region.