Lab Exam 1

Question 1

nautical charts (map)

Answer 1

2D representation of part of Earth’s surface at a reduced size

Question 2

Bathymetric chart

Answer 2

a type of isorhythmic map that depicts the submerged bathymetry (the study of underwater depth of ocean floors) and physiographic features of ocean and sea bottoms.

Question 3

contour

Answer 3

correct points of equal depth

Question 4

After WWI, what technology was used to measure the depth of the sea?

Answer 4

sonar technology: used sound waves to detect and measure depth beneath water’s surface, when waves bounce back it hits the surface of the hydroplane

Question 5

contour lines are measured from the ____

Answer 5

datum (mean sea level)

Question 6

supplemental lines

Answer 6

placed between regular contour lines to visualize small but important forms that regular contour lines are unable to show

Question 7

What are the four rules of contour lines?

Answer 7

1. equal depth
2. smooth curving lines
3. crosses flooded valley with V parts to show shallow water
4. never split or cross but may merge

Question 8

relief

Answer 8

variation in elevation or height of the land surface (difference)

Question 9

slope formula

Answer 9

relief/distance (ft/mi)

Question 10

percent gradient formula

Answer 10

relief/horizontal distant * 100

Question 11

What are the 3 units used in contour maps?

Answer 11

feet, meters, fathoms

Question 12

What’s the conversion between feet, meters, and fathoms?

Answer 12

1 fm = 2 m = 6 ft