Earth Layers and Continental Drift

Choose the best term to fill the gaps in the passage.The image here depicts a convection current below the Earth's surface. The type of boundary shown here is a​ (a)   boundary that results ​ ​ (b)   . The magma reaches the surface because ​ (c)   rises, and as the magma breaches the crust, ​ (d)   emerges.

• transform
• mantle
• divergent
• seafloor spreading
• heat
• lava

Tags

6.6

The Andes, Appalachian, and Himalayan Mountains ALL have something in common. They formed due to the

• action of divergent plate boundaries.

• 
  action at transform plate boundaries.

• action of convergent plate boundaries.

• activity taking place at the boundaries of the ring of fire.

Tags

6.6

Geologists have long recognized that earthquakes and volcanoes are not randomly distributed on Earth but occur in concentrated areas that coincide with _________

• the ring of fire.

• oceanic rift zones.

• tectonic plate boundaries.

• transform zones along plate boundaries.

Tags

6.6

Which of the these choices is not evidence supporting the theory of plate tectonics?

• the same fossil species found on different continents

• ancient cave drawing found in France

• ancient cave drawing found in France

• traces of glaciation found in Africa and South America

Tags

6.6

What was Pangaea? When did it form and when did it break apart? It was

• a large ocean basin that opened in the Triassic and closed in the Paleocene

• the supercontinent that formed in the late Paleozoic and broke apart in Mesozoic

• the huge mountain range formed when Africa pushed northward into Europe in Eocene time

• a large, Precambrian shield area of Africa and South America that broke apart early in the Proterozoic

Tags

6.6

In the diagram of the ocean basin, where is the oldest oceanic crust found?

• A

• B

• C

• D

Tags

6.6

convection in the upper mantle
magma injection at the spreading boundaries
gravity pulling the plates downward at subduction zones


These are three theorized causes of

• glacial melting.

• changing of the climate.

• high and low ocean tides.

• movement of the tectonic plates.

Tags

6.6

What geological theory explains how llamas and camels, animals that are close relatives, might be found on different sides of the world?

• 
  continental drift

• 
  natural selection

• radiocarbon dating

• endosymbiont theory

Tags

6.6

Which is a result of seafloor spreading?

• magma piles up on top of the plates involved

• the plates involved are cracked on the surface

• earthquakes occur along the edge of the larger plate

• the plates involved grow in size as the ocean floor extends

Tags

6.6

Earthquake epicenters were mapped for a 35-year period in the diagram above. The black dots marking the epicenters also represent what feature on Earth?

• hot spots

• rift zones

• plate boundaries

• 
  seafloor spreading

Tags

6.6