How does the way the sio4 groups are linked in the crystal structure affect the kind of cleavage or fracture that quartz has?

a.
the sio4 tetrahedra do not form planes in the structure so that there is no cleavage.

b.
the sio4 tetrahedra are lined up such that there are "windows" through the structure in one direction, resulting in one direction of perfect cleavage.

c.
the sio4 tetrahedra are isolated in the quartz structure, making it impossible to break evenly, and thus resulting in conchoidal fracture.

d.
the sio4 tetrahedra are arranged such that the quartz crystals cleave evenly into hexagonal prisms

You are a scientist who has been sent on a special mission to study plants and animals in south asia! your destination is an important forest in eastern india. you need to travel to 17°n latitude and 83°e longitude. which star should you travel to?

During metamorphic processes, increased pressure and temperature can affect the of minerals in rock. rocks subjected to very high pressure are typically than others because mineral grains are squeezed together, and the atoms are more closely packed. during metamorphic processes, water facilitates the transfer of ions between and within minerals, which can the rate at which metamorphic reactions take place. the growth of new minerals within a rock during metamorphism has been estimated to be about per million years. metamorphism is commonly associated with convergent plate boundaries, where two plates move toward each other. during contact metamorphism, a large intrusion will contain thermal energy and will cool much more slowly than a small one. metamorphosed sandstone is known as the metamorphic rock made from metamorphosed shale, was once used to make blackboards for classrooms

Those who hope that land reform will end the problem of mass poverty and social inequality throughout middle and south america often cite as one of the causes of the problem. a. asian immigrants b. the indigenous population c. european systems of landholding d. the power of the roman catholic church