In which Earth layer are most convection currents that cause seafloor spreading thought to be located?

• crust

• asthenosphere

• outer core

• inner core

When the hot material of the mantle RISES and the cool material SINKS, this creates

• convection currents

• magnetic fields

• hot spots

• advection forces

According to the Earth Science Reference Tables, as the depth within the Earth's interior increases, the

• density, temperature, and pressure decrease

• density increases, but temperature and pressure decrease

• density, temperature, and pressure increase

• density and temperature increase, but pressure decreases

What do Convection Currents cause on the Earth?

• movement of tectonic plates:crust

• movement of ocean water

• movement of the atmosphere:air

• movement of the core

What type of boundary exists where plates are colliding?

• Convergent

• Horizontal

• Divergent

• Transform

What does the theory of continental drift explain?

• the layers of the Earth

• why continents move

• how volcanoes formed

• how oceans formed

A deep well or mine shaft goes through which layer or layers of Earth?

• crust only

• mantle only

• crust and mantle

• mantle and core

Scientists are able to conclude that a forested ecosystem existed in Antarctica millions of years ago by studying

• the current climate.

• the fossil record.

• glacial movement.

• seafloor spreading.

A difference between the oceanic crust and the continental crust is that the oceanic crust is

• composed chiefly of sedimentary rocks.

• more dense than the continental crust.

• older than the continental crust.

• continually being created.

A student is visiting a local limestone quarry and finds fossils of seashells. The quarry is located hundreds of miles from the ocean. The fossils best indicate that

• this area was once below sea level.

• global temperature changed over time.

• erosion took place after a flood.

• volcanic activity affected the area.