Astrobio115 Ch4 Part2

The center of the Earth is made of

• solid iron and nickel

• liquid iron and nickel

• liquid rock

• solid rock

The lowest density material from the Earth is expected to be found in the

• inner core

• mantle

• outer core

• crust

Another name for the Earth's crust is the

• troposphere

• lithosphere

• asthenosphere

• mesosphere

Transfer of heat in the Earth's mantle is dominated by

• radiation

• seismic waves

• convection

• conduction

Differentiation is a process by which

• denser materials like iron sank to the center of the Earth while less dense materials like rock rose to the surface

• the Earth's surface separated into continents and oceans

• convection mixed up the materials in the interior of the Earth

• less dense materials like rock sank to the center of the Earth while denser materials like iron rose to the surface

Which of the following was NOT a source of heat that helped differentiate the Earth?

• solar radiation

• impacts

• gravitational potential energy

• radioactive decay

The amount of geological activity occurring on a terrestrial planet is related only to its distance from the Sun, only to the amount of internal radioactive heating, to its size and the amount of internal radioactive heating, or only to its size?

• only to its distance from the Sun

• only to the amount of internal radioactive heating

• to its size and the amount of internal radioactive heating

• only to its size

Plate tectonics is currently found on all of the terrestrial planets, only on Venus and the Earth, only on the Earth, Venus and Mars, or only on the Earth?

• on all of the terrestrial planets

• only on Venus and the Earth

• only on the Earth, Venus and Mars

• only on the Earth

The Earth's lithosphere has broken up into plates because of earthquakes, tidal forces due to the Moon, tidal forces due to the Sun, or mantle convection?

• earthquakes

• tidal forces due to the Moon

• tidal forces due to the Sun

• mantle convection

The Earth's tectonic plates move at a rate of a few centimeters per year, several kilometers per year, a few centimeters per century, or a few millimeters per century?

• a few centimeters per year

• several kilometers per year

• a few centimeters per century

• a few millimeters per century