In the middle of the ocean is a rift where the ocean floor squeezes out lava and pushes the ocean plates apart.
It is a primary source.
A picture can indeed be a primary source.
it is a primary source
The heat of the sun.
It is a primary source because it was taken at the time.
yes,a coin is a primary source
Primary
The primary source is Urea
Primary Source
Primary source
On land or seafloor, where they were deposited by glaciers, far from their original source.
A letter is a primary source.