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Choose all the answers that apply.

The earth's crust:

is one solid land mass

is broken into pieces

has seven main plates

is mostly made of iron and nickel

is mostly made of silicon dioxide

Over time, heat and pressure can change quartz into quartzite. Quartzite is .

an igneous rock

a sedmentary rock

a metamorphic rock

Igneous rocks are formed from .

cooling magma

eroded rock

metamorphic rock

heat and pressure

Sedimentary rocks form .

layers

beneath the earth's crust

from cooling magma

in dry locations

Choose all the answers that apply.

The continents .

were once connected

have always been in the same location

are slowly drifting

have stopped moving

are made mostly of basalt

Which of the following statements is true?

Cooling magma is slowing adding land to the continents.

Convection currents in the mantle keep crustal plates moving.

The oceanic plate is made mostly of granite and limestone.

The theory of continental drift was immediately accepted by the scientific community.

In a floral arrangement, the focal area is often

Why do you suppose the structural polysaccharide cellulose does not contain branches? why do you suppose the structural polysaccharide cellulose does not contain branches? branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby decreasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby increasing the rigidity and strength of the microfibrils. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby increasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby decreasing the rigidity and strength of the microfibrils.

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit