Flashcards in L5 - Skill Across The UK Deck (11)
What two features of the landscape are contour lines used to show?
- Height ( each contour line is at a particular height)
- Slopes (contour lines close together show steep land & widely spaced contours mean gently sloping land)
What are contour lines shown as on OS maps?
- thin orange or brown lines with numbers on them to show you the height above sea level of any point on the line
What do contour lines join?
- they join points of equal height together
What do smaller contour circles on OS maps show?
- smaller circles show a summit or basin but the inside of a contour circle is normally higher ground
What do very few or no contour lines show?
- flat areas like river valleys and the sea
When are contours on top of each other?
- they are only ever on top of one another if a vertical cave or cliff is present
What does a 'V' or 'U' shape pointing downhill denote?
- the spur of a hill
What do contours bunched together on either side of lower, more evenly spaced contours show?
- they show a valley or col ( lowest point of a ridge or saddle) between two areas of high ground
What does the geology of England mainly consist of ?
- sedimentary rocks
- youngest rocks are found in the South East around London, progressing in age in a north westerly direction
- To the N and W of the Tees - Exe line, most of the rocks are older
- More resistant igneous and metamorphic rocks are found here
- There are more faults, where upland areas were lifted by tectonic activity
What rocks are found to the S and E of the Tees - Exe line?
- Rocks are much younger
- There are weaker sedimentary rocks, which erode easily
- Limestone is also found here ( much younger and less resistant that Carboniferous limestone)