Mechanical and chemical weathering changes the earths ?

There are two types of weathering that affect theearth's surface: mechanical and chemical.Mechanical weathering is sometimes calledphysical weathering and often occurs because of temperature changes on the surface. For example, if enough water seeps into a crack and freezes, it expands.

It's lithogenous i believe of course i looked it up.

Answer after wwii, communist countries in eastern europe formed the warsaw pack, a military alliance, and comecon, an economic alliance;