3. Though Volcanism is the primary source of resurfacing
in the Galapagos Islands, erosion also plays a part in the
physical shaping of the islands. The main source of
erosion in the islands is water, driven mostly by the sea,
but also by rainfall
4. Spheroidal weathering is a type of
chemical weathering that creates
rounded boulders and helps to create
domed monoliths.
5. The plants and animals have to
conserve as much water as possible.
For example, the Gray Matplant
6. Green sand, found on the Island of
Floreana
The green tint is in fact caused by
large deposits of Olivine crystals, a
magnesium iron silicate, that have
been eroded over time from lava
rocks.
7. Red soil
• These red soils usually form from
iron-rich sedimentary rock
8. Black soil (vertisoil)
• These soils have a high content of expansive
clay, known as Montmorillonite, that form
deep cracks in dryer seasons
9. San Cristobal, is the only one that
enjoys an abundance of fresh spring
water. Small rivers fed by the "El
Junco", a volcanic crater lake, which
lies 1,350 feet above sea level, flow
gently down the rocky slopes on the
island's sun drenched southern side.
This mineral rich spring water keeps
the rich volcanic soil moist and
fertile, bringing life to the island. The
misty interior and cold Humboldt
Current enhance the floristic diversity
of this unique island."
