It describes the formation, types, and weathering of rocks, slope process, mass movement process, and types and the human impact on those weathering and slope process

1. ROCKS AND WEATHERING
BY : MR. YONAS GENEDA

2. c o n t e n t s
plate
tectonics
weathering
and rocks
slope
processes
the human
impact

3. THE EARTH'S INTERIOR

4. E V I D E N C E F O R P L A T E T E C T O N I C S
Distribution of
earth quakes
• glacial
deposits
changes in the
earth's
magnetic field
• the
geological
sequence of
rocks
the fit of the
continent
• fossil
remains

5. P L AT E B O U N DA R I E S

6. T Y P E S O F P L AT E B O U N DA R I E S

7. WEATHERING
is the decomposition and desintigration of rocks in
situ.
is central to landscape evolution, as it breaks down
rock and enables erosion and transport
key features of weathering
many minerals are fofrmed under high pressure and high temperature in
the earth's core.
weathering produces irreversible changes in a rock.
weathering causes changes in volume, density, grain size, surface area,
permeability, consolidation and strength.
weathering forms new minerals and solutions.
new landforms and features are produced TYPES OF WEATHERING

8. C O N T R O L S O F W E A T H E R I N G
The following factors affect
the type and rate of
weathering that takes place:
controls
climate
rock
structure
vegetation
rock type relief

9. s l o p e p r o c e s s e s
slope
is a surface of which one end or side is at a higher level than
another; a rising or falling surface.
many slopes vary with:
Climate
Aspect
Geological
structure
and soil
Vegetation

10. M A S S M O V E M E N T
mass movement include any large
scale movement of the earth surface
that are not accompanied by a
moving agent such as a river,
glaccier or ocean wave

11. T Y P E S O F M A S S M O V E M E N T

12. R A I N S P L A S H E R O S I O N

13. rates of mass movement can be altered by human
activities, such as building or excavation, draiange
or agriculture.
mass movement can be accelerated by destablishing
slopes.
in urban areas, the intensity of slope modification is
often very high, given the need for building s and
roads to be constructed safely, using sound
engineering principles.
T H E H U M A N I M PA C T
to reduce mass movement
these are better sstrategies
Grading
Pinning
Netting