Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
|
Source |
Where a river begins |
|
|
Confluence point |
Where two or more streams meet |
|
|
Tributary |
A stream or river that flows into a larger steam or river |
|
|
Watershed |
The boundary between two drainage basin |
|
|
Mouth |
Where a river meets the sea |
|
|
Hydraulic action |
The force of the river against the banks can cause air to be trapped in cracks .the pressure weakens this bank and gradually wears it away |
|
|
Corrasion |
Rocks carried along by the river wear down the river bed and banks |
|
|
Attrition |
Rocks being carried by the river smash together and break into smaller and smoother rocks |
|
|
Corrosion |
Where a chemical reaction happens between certain rock types and the river water.then it eats through the rock |
|
|
V shaped valleys |
Vertical erosion is most important near the source The river cuts down into the bed through hydraulic action, attrition and corrosion Due to vertical erosion the steep valley sides become unstable Mass movement on the valley sides such as soil creep, leads to v shaped valley forming |
|
|
Interlocking Spurs |
Rivers erode vertically in the upper course and erode the softest rock fastest If there is any hard rock the river will erode around it instead of through it to crest zig zag pattern The ridges left behind are interlocking Spurs |
|
|
Waterfalls |
Hard rock and soft rocks are found together in layers, with the hard rock on top. Erosion of the soft rock is fasted. The hard rock is undercut over time to make an overhang. It is unsupported and will collapse. Over time the waterfall will move back upstream leaving a long gorge also it's leaves a plunge pool |
