Exogenic Processes Earth Science, Slides of Biology

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GROUP 4 REPORT

EXOGENIC

PROCESSES

WHAT IS EXOGENIC PROCESSES?

• external processes that occur at or near the Earth's surface. EXOGENIC PROCESSES
• include degradation and aggradation processes.

• external processes that occur at or near the Earth's surface. EXOGENIC PROCESSES
• include degradation and aggradation processes.
• Weathering is a type of degradation process.

• WEATHERING -the physical breakdown and/or chemical alteration of rocks at or near the Earth's surface is referred to as WEATHERING.

• WEATHERING -the physical breakdown and/or chemical alteration of rocks at or near the Earth's surface is referred to as WEATHERING. -weathering can be MECHANICAL or CHEMICAL

3 TYPES OF MECHANICAL WEATHERING

FROST WEDGING -occurs in regions where temperature fluctuates above and below freezing point.

FROST WEDGING -when ice thaws, water can flow further into the rocks.

FROST WEDGING -when ice thaws, water can flow further into the rocks. -repeated freeze-thaw cycle weakens the rock.

THERMAL STRESS -results from the expansion and contraction of rocks caused by temperature changes. -the outer surface of the rock is often warmer or colder than the inner portions.

THERMAL STRESS -the process of peeling off is called EXFOLIATION.

PRESSURE RELEASE -occurs when the overlying rock eroded away, causing the outer rock layer to expand more than the layer underneath. -this expansion may separate the outer rock from the rock body.

PRESSURE RELEASE -the exfoliation due to pressure release is often called SHEETING.