Solve these clues to fill the grid.
- A numerical scale used to compare variables with one another or with some reference number
- 3 Across
- A body of water surrounded by land
- 4 Across
- A seat of government (plural)
- 5 Across
- Long stream of water flowing to the sea
- 7 Across
- A politically organized body of people under a single government (plural)
- 9 Across
- A land mass that projects well above its surroundings
- 12 Across
- Huge body of salt water (plural)
- 13 Across
- A major road for any form of motor transport
- 1 Down
- A large and densely populated urban area (plural)
- 2 Down
- An imaginary line around the Earth parallel to the equator
- 4 Down
- The angular distance between a point on any meridian and the prime meridian at Greenwich
- 6 Down
- One of the large landmasses of the earth
- 8 Down
- An arbitrary sign that has acquired a conventional significance
- 10 Down
- An imaginary line around the Earth forming the great circle that is equidistant from the north
- 11 Down