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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.

1: is one solid land mass, has 7 main plates, is mostly made of silicon dioxide.2: a metamorphic rock.3: cooling magma.4: in dry locations. 5: were connected, are drifting. 6: 4

Explanation:

1:Earth's crust is divided into 7 major and several minor tectonic plates which float on a semi-fluid layer called the asthenosphere. Silicon is the second most common element present in the crust with an abundance of 276,900 ppm. It exists as a compound in the mantle and the crust. In the crust, it exists combined with oxygen to form silicate minerals.2: Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone.3:Igneous rock is formed through the cooling and solidification of magma or lava.4:Sedimentary rocks are types of rock that are formed by the accumulation or deposition of small particles and subsequent cementation of mineral or organic particles on the floor of oceans or other bodies of water at the Earth's surface.

the answer is   c.) 1575 j.

explanation: