Geology 12 (1-3) - Weathering around WVSS by Tess Gardiner

Ms.Gardiner

tessgardiner1 — 2018-02-15 16:58:24 UTC

1. chemical weathering - hydrolysis
2. I can tell because.....
3. The cause of this weathering is.....

Sasha - 1

2018-02-15 17:33:27 UTC

1. Frost wedging.
2. There's a small crack in cement.
3. The rain water seep into the rock, repeatedly freeze and thaw, forcing the rock to expand, and form a crack in the rock.

Joe and Cate - Biological Weathering

joer230 — 2018-02-15 17:33:55 UTC

Plant (lychen and moss). It is growing on the cement/rock therefore is it breaking down as it creates minature cracks. This is bioligical weathering because it is an organism.

Kevin, Oliver, Q

2018-02-15 17:35:45 UTC

Frost wedging - Water inbetween crack causing expansion - due to cold weather. Crack in the middle of a rock, wet in the middle.

Regina and Sierra

2018-02-15 17:37:57 UTC

1) Mechanical Weathering-frost wedging
2) there is a forced crack in the rock
3) precipitation in cold climate causes constant freezing and thawing of water in the cracks of the rock, forcing the rock apart

Sasha - 2

2018-02-15 17:38:04 UTC

1. Dissolution.
2. The presence of lichen tells me that it is dissolution weathering.
3. Dissolution can be caused by acid rain or lichens. Acid rain will tend to breakdown the minerals and change their composition, and lichens slowly dissolve the molecule of the surface of the rocks.

Q, Kevin, Oliver

2018-02-15 17:39:03 UTC

Dissolution - dissolving by acidic water causing lichens to form. Can tell it’s lichen due to discolouration of the rock.

Mahan&Kash

2018-02-15 17:39:56 UTC

1- Oxidation
2- Change in the rock colour to red
3- presence of oxygen, Iron Oxide

Joe and Cate - Chemical Weathering

joer230 — 2018-02-15 17:40:07 UTC

Oxidization - Chemical weathering. The reddish tinge on the side shows us the weathering. Presence of oxygen and water because it was near moisture.

Kiu, Kevin, Oliver

2018-02-15 17:40:17 UTC

Hydration - Rain water added to feldspar, forming clay. Looks like sand but muddy.

Joelle and Diana

2018-02-15 17:40:36 UTC

Mechanical Weathering
- we can tell because there has been a physical change in the rock (pavement), it’s been cracked and the rock has no evidence of change in the chemical composition

- The cause could’ve been the rain and the cold weather that followed afterwards. The rain causes water to fill in the cracks of the rocks and they freeze because of the cold weather causing the rock to expand and contract.

Regina and Sierra 2

2018-02-15 17:41:33 UTC

1) chemical weathering-oxidation
2) discolouration of the rock-red, rusty colouring
3) Moisture in the environment (water) and oxygen causes oxidation of the rock. (Was near water)

Regina and Sierra 3

2018-02-15 17:44:42 UTC

1) chemical weathering- dissolution
2) moss like feature, lime green colour,
3) cause: dissolving by acidic water, forming lichens

Joe and Cate - Mechanical Weathering (Frost Wedging)

joer230 — 2018-02-15 17:44:56 UTC

One can tell as water has gone into the cracks, freezing and thawing many times - which weakens the rock and cdeates cracks. Cool temperatures and percipitation is the main cause for the water to freeze over ans thaw

Mahan&Kash2

2018-02-15 17:44:58 UTC

1-Lichens
2- due to growth of Lichen on the rock
3- Breaking down the rock in to small sedimen

Sasha - 3

2018-02-15 17:46:03 UTC

1. Oxidation.
2. The rust (reddish brown colored) at the surface tells me that it is oxidation.
3. Oxygen react with the substances in the rocks to form rust, clays, quarts, then weaken the rock. Oxidation usually occurs with hydrolysis.

Mahan&Kash3

2018-02-15 17:48:13 UTC

1-Frost wedging
2- we can see cracks in between the rock
3- breaking the rock

Joelle and Diana 2

2018-02-16 00:18:41 UTC

-Example of chemical weathering
- chemical weathering is evident from the rounded shape of the rock.
- the cause of this weathering could be due to dissolution, the rock has been rounded and dissolved by acidic rain.

Joelle and Diana

2018-02-16 00:37:47 UTC

Mechanical weathering
The mechanical weathering is evident from the cracks in the rock.
The cause of this weathering may be due to biological weathering where the roots of the plant have contributed in breaking the rock apart.

Joel Jang

2018-02-16 21:53:54 UTC

1. Frost wedging
2. There is a crack on cement
3. It’s frost wedging due to the freezing of water when it rains, casuing expansion of the water and breaking the rock.

Joel Jang

2018-02-16 22:11:44 UTC

1. chemical weathering(oxidation)
2. There is a redish colour on a rock(inside the water)
3. The rock was in the water for a long time. Due to oxygen the rock gets oxidized, becomes weak and easily crumbles. Also casuing redish colour on a rock.

Damon Shan

2018-02-20 02:52:03 UTC

1.Chemical weathering(Oxidation)
2.Rock turns red when in contact with water
3.Oxygen is dissolved in water, Iron oxides, when water comes in contact, it dissolves the rock.

Damon Shan

2018-02-20 03:00:47 UTC

1.Biological weathring
2.There is lichen on the rocks
3.It is caused by activities of living organisms

Damon Shan

2018-02-20 03:39:31 UTC

1.Mass wasting
2.There is a river nearby, so soil creep happened because of water
3.Water in soli creep causes soil to expand and become heavier