Cuáles son las actividades económicas del sector primario, secundario y terciario

Blank is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

[ou.01jthe greatest speed with which any physical object moves is 300,000 km/soundsec. which of the following has a speed of 300,000 km/sec? a.light in water b.light in vacuum c.sound in air. d. sound in water