are rare in occurrence
1occurrence */*/ — UK [əˈkʌrəns] / US [əˈkɜrəns] noun Word forms occurrence : singular occurrence plural occurrences a) [countable] something that happens, especially something unexpected and unpleasant Unfortunately, computer errors are a common occurrence. b)… …
2occurrence — oc|cur|rence [ ə kɜrəns ] noun ** count something that happens, especially something unexpected and unpleasant: a rare/common/regular/everyday occurrence: Unfortunately, computer errors are a common occurrence. a. uncount occurrence of the fact… …
3Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …
4rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …
5Rare Earth hypothesis — In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the emergence of complex multicellular life (metazoa) on Earth required an improbable combination of astrophysical and geological events and circumstances. The term… …
6occurrence — noun ADJECTIVE ▪ common, everyday, widespread ▪ daily, frequent, regular ▪ rare, uncommon ▪ …
7rare — adj. VERBS ▪ be, seem ▪ become, get ▪ remain ▪ be considered ▪ 19 species of the bird are consider …
8Dakshinavarti Shankh — A Shaligram Shila decorated for worship with tulsi and a rare Dakshinavarti Shankh Dakshinavarti Shankh, Valampuri Sangu [in Tamil] or Sri Lakshmi Shankh, is a sacred Hindu object otherwise known in English as a conch shell. This is the shell of… …
9British Birds Rarities Committee — |The British Birds grouse logo|thumb|250px |rightThe British Birds Rarities Committee (BBRC), established in 1959, is the recognised national bird rarities committee for Britain. It assesses claimed sightings of rare birds ( BB rarities ), based… …
10HEBREW LANGUAGE — This entry is arranged according to the following scheme: pre biblical biblical the dead sea scrolls mishnaic medieval modern period A detailed table of contents precedes each section. PRE BIBLICAL nature of the evidence the sources phonology… …