This means the person has no heartbeat and no brain activity. The person is dead.
Lines with no slope are horizontal lines or flat lines
That phenomenon typically occurs when someone has sat on your globe.
Surface
On a flat Euclidean surface, parallel lines cannot meet. On a sphere, parallel lines CAN meet.
isoelectric lines!
In general, they are called horizontal lines, but they will only be that if they have a zero slope. They'll be "level" or "flat" lines.
It will roll around. To make a flat map from a round globe, a projection is used. In making the projection not all measures can be preserved and so distances will be stretched for some areas, and straight lines on the projection will correspond to curved lines on the globe. There are different projections that can be used which try to minimise the effect on different measures.
the plateau will get flat
plane
A plane.
They are lines that are not horizontal nor vertical.
The land is relatively flat.