Mapwork

Question 1

What is river capture?

Answer 1

When a stronger river diverts the flow of another river into its drainage basin.

Question 2

What is the river that steals water called?

Answer 2

The Captor River.

Question 3

What is the smaller river left behind after river capture called?

Answer 3

A Misfit River

Question 4

What is abstraction?

Answer 4

When the watershed lowers and shifts position.

Question 5

How do antecedent drainage patterns form?

Answer 5

When land is uplifted by tectonic activity but the river keeps its original course.

Question 6

What is a topographic map scale?

Answer 6

1 : 50 000.

Question 7

What is an orthophoto map scale?

Answer 7

1 : 10 000.

Question 8

Which map shows more detail?

Answer 8

Orthophoto map.

Question 9

Which map is cheaper to produce?

Answer 9

Orthophoto map

Question 10

What is a topographic map?

Answer 10

A map using symbols and contour lines to represent real features.

Question 11

What is a word scale?

Answer 11

A scale written using words (e.g. 1 cm represents 500 m).

Question 12

What is a ratio scale?

Answer 12

A scale written as a ratio (e.g. 1:50 000).

Question 13

What is a line scale?

Answer 13

A diagram showing distance visually.

Question 14

What are contour lines?

Answer 14

Lines connecting points of equal height.

Question 15

What do contour lines show?

Answer 15

Elevation, landforms, and slope steepness.

Question 16

In what unit is height shown on maps?

Answer 16

Meters (m).

Question 17

What is a trigonometric station?

Answer 17

A point showing the exact height of a hill or mountain.

Question 18

What is a spot height?

Answer 18

A black dot with the height number next to it.

Question 19

What is a benchmark?

Answer 19

A marker showing height along a road or railway.

Question 20

How do you calculate distance on a topographic map in meters?

Answer 20

Multiply the map distance by 500.

Question 21

How do you calculate distance on a topographic map in kilometers?

Answer 21

Multiply by 0.5.

Question 22

How do you calculate distance on an orthophoto map in meters?

Answer 22

Multiply by 100.

Question 23

How do you calculate distance on an orthophoto map in meters?

Answer 23

Multiply by 100.

Question 24

What are the four main cardinal directions?

Answer 24

North, South, East, West.

Question 25

What is magnetic declination?

Answer 25

The angle between true north and magnetic north.

Question 26

In South Africa, magnetic north is found where relative to true north?

Answer 26

West of true north.

Question 27

What is a bearing?

Answer 27

A precise direction measured in degrees (0°–360°).

Question 28

What is the formula for magnetic bearing?

Answer 28

Magnetic Bearing = True Bearing + Magnetic Declination.