Earth's Interior & Convection and the Mantle

Continental crust consists mainly of rock called_.

• granite

• basalt

• flourite

• agate

Holes drilled several kilometers into Earth's crust provide direct evidence about Earth's interior in the form of_____.

• seismic waves

• liquid iron

• volcanic eruption

• inner core

Geologists obtain indirect evidence about Earth’s interior by____.

• estimating temperature inside earth

• directly looking under the many layers

• measuring pressure differences at Earth’s surface

• recording and studying seismic waves

What is the correct order (starting from the surface) of Earth’s layers?

• mantle, outer core, inner core, crust

• crust, mantle, outer core, inner core

• crust, outer core, inner core, mantle

• outer core, inner core, crust, mantle

Earth’s inner core is

• a layer of molten metal

• a layer of hot rock

• a dense ball of solid metal

• a layer of rock that forms Earth’s outer skin

Heat transfer within a fluid takes place by

• radiation

• conduction

• density

• convection currents

How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?

• by determining the age of rock samples obtained by drilling on the sea floor

• by measuring how fast seafloor spreading occurs

• by observing eruptions of molten material on the sea floor

• by mapping rocks on the sea floor using sonar

Most geologists think that the movement of Earth’s plates is caused by

• conduction

• convection currents in the mantle

• earthquakes

• Earth's magnetic field

Scientists think that convection currents flow in Earth’s

• continents

• lithosphere

• inner core

• mantle