Rocks and landscapes de sergio gutierrez fernandez Presentation Transcript
Types of Rocks
-Igneous rocks: From volcanic activity.
-Sedimentary rocks: Either of small particles
of other rocks that have been eroded and
transported or of the remains of plants and
-Metamorphic rocks: Altered by extremes of
heat and/or pressure.
the breaking up and
decay of rocks in
places where they
-It is when water and air activate
chemical changes that cause rock
to rot and decay. Chemical
reactions are greatest where the
climate is very warm and wet.
The Structure of a
Rock can affect
-Its resistance to erosion
and its permeability to
-The harder the rock, the more
resistant it is likely to be to
erosion. Hills and mountains tend
to form in areas of harder rock
while valleys are found on softer
-Impermeable rock has numerous
surface rivers and may be badly
drained, in contrast to permeable
rock which has few surface rivers;
What do chalk
areas look like?
-Chalk, which is a soft
limestone, occurs in southeast England. It is
permeable and so, as it is
relatively resistant to
erosion, it can form:
*Low-lying, gently rounded
Why Carboniferous limestone
produces distinctive landforms?
When a river reaches
-It begins to dissolve joints
and bedding planes.
-Sometimes solution is so
active that form
-The river flow over the
impermeable rock until it
reaches the surface. The
place where it reappears is