Earth's Structure Test

The earth is composed mainly of ________

• water

• iron

• metals

• rock

______% of the Earth's surface is covered by water

• 60

• 75

• 85

• 95

Earth's inner core is composed mainly of

• molten rock

• solid iron and nickel

• heated gasses

• all of the above

Earth's outer core is composed mainly of

• liquid iron and nickel

• solid nickel and copper

• heated gasses

• none of the above

The rotational motion of the Earth creates a dynamo effect where a magnetic field is generated.

• true

• false

Earth's outer layer is called the

• shell

• outer plate

• mesosphere

• crust

Tectonic plates

• move very slowly

• sometimes press against or pull away from each other

• sometimes scrape against each other

• all of the above

Mountains can form where tectonic plates collide.

• True

• False

Seismologists study

• ocean tides

• mountains

• volcanic activity

• earthquakes

Oceanic plates are thicker than Continental plates

• true

• false