A valley is a low area of land between hills or mountains, typically with a river or stream flowing through it. Valleys are one of the most common landforms on the surface of the planet. There are three main types of valleys, the V-shaped valley, the flat floored valley and the U-shaped valley.
A plain is a low lying flat land surface with a very gentle slope , a plain is a flat, sweeping landmass that generally does not change much in elevation. Plains occur as lowlands along the bottoms of valleys or on the doorsteps of mountains, as coastal plains, and as plateaus or uplands.
A topographical globe displays the physical landforms of the Earth. Landforms are the gross physical shapes of the planet. Mountains, plateaus and valleys define various areas of the Earth as does the specific features of a face defines each person.