Question

geology unit test
do not write on the test. mark all your answers for the test on your scantron.
multiple choice. select the choice that best completes the statement or answers the question

1. what is the correct order of the earths layers, starting from the surface?

a. lithosphere, asthenosphere, mantle, inner core, outer core
b. asthenosphere, lithosphere, mantle, inner core, outer core
c. lithosphere, asthenosphere, mantle, outer core, the inner core
d. the outer core, inner core, asthenosphere, mantle, lithosphere

1. a liquid metal flow is characteristic of which layer of earth?

a. inner core
b. asthenosphere
c. mantle
d. outer core

1. which layer of earth comprises the crust and the uppermost portion of the upper mantle?

a. asthenosphere
b. lithosphere
c. oceanic crust
d. continental crust

1. convection currents form when heated materials become...

a. denser and rise.
b. less dense and rise.
c. depressurized and sink.
d. heavier and sink.

1. most geologists rejected alfred wegeners idea of continental drift because...

a. wegener used erroneous evidence to support his hypothesis.
b. wegener was interested in what the earth was like millions of years ago.
c. wegener used several different types of evidence to support his hypothesis.
d. wegener could not identify a force that could move the continents.

1. tectonic plates float on...

a. the lithosphere
b. the asthenosphere
c. portions of continental crust
d. portions of oceanic crust

1. the hawaiian islands were formed by...

a. the subduction of an oceanic plate beneath another oceanic plate
b. the movement of the pacific plate over a hot spot in the mantle
c. the movement of an oceanic plate away from another oceanic plate
d. the movement of two oceanic plates along a fault

1. a mid - ocean ridge is...

a. where old crust sinks back into the mantle
b. found only in the pacific ocean
c. located mainly along coastlines
d. where new oceanic crust is formed

Explanation:

1. The Earth's layers from the surface are lithosphere, asthenosphere, mantle, outer - core, inner - core.
2. The outer core is a liquid - metal layer.
3. The lithosphere consists of the crust and the uppermost part of the upper mantle.
4. When heated, materials become less dense and rise to form convection currents.
5. Wegener couldn't identify a force for continental drift, which led to rejection of his idea.
6. Tectonic plates float on the asthenosphere.
7. The Hawaiian Islands formed due to the movement of the Pacific Plate over a mantle hot - spot.
8. Mid - ocean ridges are where new oceanic crust is formed.

Answer:

1. c. lithosphere, asthenosphere, mantle, outer core, the inner core
2. d. outer core
3. b. lithosphere
4. b. less dense and rise
5. d. Wegener could not identify a force that could move the continents
6. b. the asthenosphere
7. b. The movement of the Pacific Plate over a hot spot in the mantle
8. d. where new oceanic crust is formed