Learning
(n.) a line or limit that indicates where two things become different
boundary
Running is one activity that requires a lot of _____.
energy
______ occurs in rivers when rocks are worn away by the moving water.
erosion
(n.) a very large area of ice that moves slowly down a mountain or across a large area of land
glacier
A man at the store ________ how to use the sharp knives that were for sale.
demonstrate
_______________ continues to cause areas like North America and Africa to move farther apart.
continental drift
Lava, or _____ rock, often flows out of a volcano during an eruption.
molten
The Earth's _____ is a rocky shell that measures about 2,900 kilometers thick.
mantle
(n.) a crack in Earth’s crust where earthquakes are more likely to occur
fault line
(n.) something that has been made in a certain shape
formation
Many American _________ have trails that allow hikers to climb across several mountains.
mountain range
(n.) a natural depression in the surface of the land
basin
That is ______ ink, so the stain will never go away.
permanent
The metal gate ______ the cars from entering the parking lot.
prevent
Many people were amazed when Jake's ________ about the future became true.
prediction
(n.) the study of the large layers of rock under the surface of Earth and how they were formed and move
plate tectonics
(v.) to make or become worse
deteriorate
(n.) a large area of land, such as a continent or a large island
landmass
(n.) solid matter, such as rocks and sand, that is left somewhere by water or wind
sediment
______ can turn large mountains into small hills over time.
weathering