agglomerate
rock
large, coarse, rock fragments associated with lava flow that are ejected during explosive volcanic eruptions. Although they closely resemble sedimentary conglomerates, agglomerates are pyroclastic igneous rocks that consist almost wholly of angular or rounded lava fragments of varying size and shape. Fragments are usually poorly sorted in a tuffaceous matrix, or appear in lithified volcanic dust or ash.Depending on the specific context, some geologists prefer to sort agglomerates into either bombs (bomb), blocks, or breccia. Bombs and blocks are generally larger than 32 mm (1.25 inches) in size; although bombs are ejected in a molten state (becoming rounded upon solidification), blocks are erupted as solid angular or subangular fragments. Upon accumulation, blocks form breccia, which are solid angular fragments larger than 64 mm.
- Ranger
- ranger
- Rangitata River
- Rangitikei River
- Rangpur
- Ranidae
- Ranieri Calzabigi
- Ranjit Singh
- Ranked According to Drainage Area, Table World's Principal Rivers
- Ranked According to Drainage Area World's Principal Rivers, Table
- Ranke, Leopold von
- Rankine cycle
- Rankine, William John Macquorn
- Rankin, Jeannette
- Rank, J Arthur Rank, Baron
- Rank, Otto
- Ranks of Coal as Classified by the American Society for Testing and Materials, Table
- Ranks, Table of
- Rannoch
- Rann of Kachchh
- Ranong
- Ransier, Alonzo J.
- Ransome, Arthur
- Ransom Eli Olds
- Ransom, John Crowe