Plate Tectonic Theory

What type of plate boundary occurs between the North American Plate and the Eurasian Plate, shown in the figure below?

The youngest part of the ocean floor is found ____.

The downward part of a convection current causes a sinking force that ____.

The East African Rift is an example of a ____.

What type of plate boundary occurs between the Nazca Plate and the South American Plate, shown in the figure below?

Alignment of iron in rocks when they are formed reflects the fact that Earth's ____ has reversed itself several times.

Seafloor spreading occurs because ____.

The driving forces of tectonic plates are related to convection currents in Earth’s ____.

Scientists rejected Wegener’s hypothesis of continental drift because he could not explain how or why continents move.

(True/False) Ocean trenches are formed along lines where two plates diverge under the water.

Scientists have observed that the continents move apart or come together at speeds of a few centimeters

Plates of the lithosphere float on the ____.

The crust and upper mantle make up Earth's ____.

Features found at divergent plate boundaries include ____.

The features marked by the letter Y are ___________________________________.

(True/False) The circulation of material caused by differences in density is called convection.

As new seafloor moves away from an ocean ridge, the seafloor cools and becomes less dense than the material beneath it.

The Himalayan mountain range of India was formed at a ____.

(True/False) If two continental plates converge, a subduction zone forms.

Why do continents float on top of the mantle?

Hot magma fills the gap that forms at the ridge.

Active volcanoes are most likely to form at ____.

Plates move apart at ____ boundaries

(True/False) Mid-ocean ridges are formed along lines where two plates diverge under the water.

The arrows in the mantle and oceanic crust indicate the direction of flow of ______________________ beneath the plates.

The feature marked by the letter X is a(n) _________________________.

While studying the ocean floor, scientists found ____ bands of magnetism.

____ are formed when two continental plates collide.

The result of plate movement can be seen at ____.

The magma hardens, to form a small amount of ocean floor.