Transcript Changes to Earth - Effingham County Schools

Changes to Earth
Mountains
Volcanoes
• The mantle is solid but capable of flow (like
hot asphalt or fudge). Under special
conditions like at hot spots and along plate
boundaries the mantle or crust melt to make
magma, which then rise to the surface to
make a volcanic eruption.
Hot spots
Hawaii
• Hawaiian Islands
were formed from
Hot Spots
• Major geological events, such as earthquakes,
volcanic eruptions, and mountain building,
result from these plate motions.
Underwater trench
• Some changes in the earth’s surface are
abrupt, such as earthquakes and volcanic
eruptions, while other changes happen very
slowly such as uplift and wearing down of
mountains.
Abrupt Changes
• Volcano
Gradual Changes
Abrupt Changes
• Earthquake
Gradual Changes
Abrupt Changes
• Mudslide
Abrupt Changes
• Volcano
Abrupt Changes
• Volcano
• Moving plates cause major changes in a world
map over tens of millions of years.
• Pangaea was the most recent of a succession
of supercontinents that have formed and
broken up over time.
• Earthquakes represent sudden breaks in crust
continuously stressed by plate movement.
Gradually over time, the same movements
results in major crustal features.