The Earth is a sphere.
Looking at a sphere, the Earth, from the side, i.e. - the equator, eliminating each 'pole' position, which would appear as 'points', as opposed to 'lines', lines drawn at one degree intervals from top (North) to bottom (South), would number 178; given that there are 180 degrees from North to South.
lines of latitude
contour lines
The vertical (or latitude) scale increases with latitude, keeping the hoizontal (longitude) constant. This is in order to make the lines of longitude parallel on the chart, instead of, in reality, converging toward the poles. This allows courses to be plotted and drawn on the chart, as straight lines crossing the lines of longitude at the same angle. Known as 'plane sailing'. ie. it is on a plane (flat surface) not a globe.
The lines of force are on the northern and southern poles
Straight lines on paper can be drawn by using the edge of a ruler (or straight-edge) and a pencil.
A square by definition has lines of symmetry. Therefore a square cannot be drawn without any lines of symmetry.
Yes. You can draw infinitely many straight lines from each point.
The straight line connecting the poles is the earth's rotational axis. The lines along the earth's surface from pole to pole are meridians or lines of longitude.
They are drawn on the earth as imaginary lines that run from east to west.
3 lines and one plane
line segments
1 straight line. An infinite number of curved lines.
If you're talking about straight lines (not curves) the answer is one.
In line mode the ruler is drawn as great circles (shortest possible path), which should be as a "crow flies". The ruler in Google Earth allows measurement of distances for a straight line or paths. Note for large distances (e.g. > 2000 miles) lines are drawn different than the lat-lon grid lines in Google Earth.
Grid lines
i think just one line, as its defenition of straight line