Starch it? Starch makes shirts stiff, like collars and cuffs.
straight down.
To short for you
a line that goes straight up and down is a horizontal line a vertical line is straight up and down vertical like raising hand up or down to answer questions horizontal like like holding a hot dog you would not hold a hot dog up and down you would hold it side to side
A taproot, such as a carrot or palm tree.
If the train is travelling at a constant speed the pen is also travelling at a constant speed and will drop straight down but if the train accelerates or brakes after the pen is dropped it will not drop straight down. This is because it has it's own inertia, it still drops straight but everything else has changed their inertia so it just looks as if the pen is different.
A vertical line goes upwards, and a horizontal line goes across.
Water pollution that goes with water down a storm drain that goes straight to a river or stream.
A vertical line goes straight up an down, so a vertical line segment is a line segment that goes straight up and down. Simple.
as pressure goes UP, temp. goes DOWN as temp. goes UP, pressures goes DOWN
A vertical line goes up and down otherwise to say it goes straight up
vertical
Very dangerous. What goes up WILL come down again.