which location-sharing service offers items for users as a gaming component and also allows them to collectively link their check-ins to publish a trip?

What two properties affect the density of ocean water

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.

Which soil layers comprise the topsoil? o horizon a horizon b horizon c horizon