TROPISM

• Their are 4 types-
• Phototropism
• Geotropism
• Gravitropism
• Thigmotropism

PHOTOTROPISM

• When the plant responds to light
• or grows towards the sun.

GEOTROPISM

• When the roots of a plant grow downward
• responding to gravity

GRAVITROPISM

• When gravity pulls plants down to the
• center of the earth.
• Responding to gravity

THIGMOTROPISM

• When the leaves or vines rap around
• the plant or tree.

EROSION

• wind erosion
• glacier erosion
• raindrop erosion
• mass movement

wind erosion

• The process of wind wearing away
• The earths surface.

GLACIER EROSION

• The process by which ice washes away
• the top layer of the earths surface.

RAINDROP EROSION

• When a raindrop hits the ground
• and spreads out the soil.

MASS MOVEMENT

• Movement of surface material
• caused by gravity.

WEATHERING VS EROSION

• Erosion-the movement of loosened or weathered
• material from one place to another.
• Weathering-the mechanical and chemical breakdown of
• Rocks by the action of rain, snow, etc...

CHEMICAL WEATHERING

• Changes the composition of rocks,
• Often Transforming them when water
• Interacts with minerals causing a chemical
• Reaction

PHYSICAL

• The breakdown of rocks and soils through direct contact
• With heat, water, ice and pressure.

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