They are called volcanic bombs.
Blocks is the name used for the biggest pieces of tephra. Tephra is produced by a volcanic eruption.
Dust is less then 0.25 in diameter, ash is larger then dust but less then 2 mm in diameter, and the somewhat larger tephra are called lapilli which are larger than dust but less then 64 mm in diameter.
Volcanic airborne debris is classified as either solid (tephra, aka pyroclasts, including "volcanic bombs") or particulate (ash). Lava chunks ejected into the air around a vent is called "spatter."*When solids condense from gaseous pyroclastic flows, the rock material is called ignimbrite.
This is called a volcanic bomb.
If you are referring to the crossword puzzle clue, a medium sized tephra is also known as lapilli.
They are called volcanic bombs.
Blocks is the name used for the biggest pieces of tephra. Tephra is produced by a volcanic eruption.
Perhaps it is called the Betelgeuse * * * * * But only if you consider a red supergiant to be a medium-sized star!
Henry
pup
caca
It's a bloomer.
Medium sized animals don't have a specific name.
Medium-sized is an adjective.
The kind of dog that is medium sized and is white with a little blond spots on it is called Dalmatian.
no venus is not a medium sized planet.