Gemstones are commonly found in pegmatites, which are igneous rocks that are a. exceptionally mafic b. exceptionally coarse grained c. exceptionally fine grained d. extrusive, forming from lava

Irelanda. populationb. square mileagec. average population density per square mile

Which of these scenarios is most similar to the aztec empire's system of agriculture? a. a farmer plants the same crops b. a farmer observes the behavior c. a farmer watches the sun’s patterns d. a farmer plants many different crops

In which layer of the atmosphere are the particles so far apart that they can travel hundreds of kilometers without colliding with each other? a. exosphere b. troposphere c. mesosphere d. thermosphere