Geography Definitions

What is the crust?

• The outermost layer of the earth. It is thin and rocky with a changing thickness.

• The inner solid ball that is made up of two metals - iron and nickel.

• A rock-hard layer that actually flows around the outer core.

• A layer made up of mostly melted, hot, liquid iron and nickel that flow around the inner core.

What is the mantle made of?

• Mostly composed of liquid iron and nickel.

• Made almost entirely of metal—specifically, iron and nickel.

• Made up of magnesium, aluminum, silicon, and oxygen silicates so hot that they flow.

• Made of solid rock, mostly basalt and granite.

What is the outer core?

• Liquid, iron-nickel layer of the Earth between the solid inner core and lower mantle.

• The innermost layer of the Earth.

• A semi-solid magma layer consisting of iron, magnesium, and silicon.

• The outside layer of the earth and is made of solid rock, mostly basalt and granite.

Where is the inner core found?

• At the very center of the Earth.

• On the outside of the second layer, encasing the other layers.

• Cushioned between the second layer and inner layer.

• Underneath the first layer of the Earth and above the inner layer.

What is the meaning of lithosphere?

• The envelope of gases surrounding the earth or another planet.

• 1. The upper layer of the earth's mantle, in which there is relatively low resistance to plastic flow and convection is thought to occur.

• The rigid outer part of the earth, consisting of the crust and upper mantle.

• The total amount of water on a planet.

What is a tectonic plate?

• The thinnest part of the crust near the sea floor.

• The outermost layer of the earth.

• 1. The gradual movement of the continents across the earth's surface through geological time.

• Large sections of the Earth's crust that move independently.

What causes continental drift?

• The spreading of the seafloor and convection currents in the earth's mantle.

• The impact of the colliding plates, or when two plates come together.

• Two tectonic plates pass laterally by one another.

• Earthquakes.

What is a convergent boundary?

• When two plates come together.

• When two plates separate.

• When two plates slide by each other.

• When the convection currents in the mantle move the tectonic plates.

What is a divergent boundary?

• When two plates slide by each other.

• When two plates move away from each other.

• When two plates collide.

• When two plates go on top of each other.

What is the definition of asthenosphere?

• 1. The upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.

• The rigid outer part of the earth, consisting of the crust and upper mantle.

• The envelope of gases surrounding the earth or another planet.

• The dimensions of height, depth, and width within which all things exist and move.