sinkhole

related words
rhyolite
subsoil
orogeny
pyroclastic
dory
br''signed
massif
tephra
br''party
breccia
basin_countries
max-depth
irrigated
evapotranspiration
br''forests
br''water
residence_time
br''exclusive
wherry
karst
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related topics
{island, water, area}
{utc_offset, utc_offset_dst, timezone}
{line, north, south}
{god, call, give}
{build, building, house}
{land, century, early}
{county, mile, population}
{area, community, home}
{service, military, aircraft}
{city, population, household}
{specie, animal, plant}
{borough, population, unit_pref}
{city, large, area}
{law, state, case}
{company, market, business}
{area, part, region}
{household, population, female}
{school, student, university}
{system, computer, user}
{town, population, incorporate}