Rapid Changes
This rapid change is an opening in Earth's surface through which lava, ash, and gases are forced out.
What is a volcano?
This 24-hour cycle is caused by Earth rotating on its axis.
What is the day/night cycle?
This process is the primary driving force behind the water cycle, providing the energy for evaporation.
What is the Sun?
This event is described as a sudden shaking or trembling of Earth's surface caused by rocks shifting deep underground.
What is an earthquake?
These are the apparent shapes of the Moon seen in the sky as it orbits Earth every 28 days.
What are Moon phases?
This type of rock forms from small bits of material like sand and pebbles being pressed and cemented together over millions of years.
What is sedimentary rock?
Often triggered by heavy rains or earthquakes, this is the sudden movement of soil or rock from higher to lower ground.
What is a landslide?
This term describes the phases where the visible part of the Moon appears to be growing larger.
What is waxing?
Energy sources like coal, oil, and natural gas that form from the remains of ancient organisms are known by this name.
What are fossil fuels?
This hot, melted rock flows out of a volcano and can eventually harden to create new land.
What is lava?
This phenomenon occurs because the Sun appears low in the sky during the early morning and late afternoon, making these dark shapes appear longer.
What are shadows?
In the water cycle, this process happens when water vapor cools and changes back into liquid droplets, forming clouds.
What is condensation?
While often destructive, volcanic eruptions are also considered this because they can build new mountains and islands.
What is constructive?
This phase occurs approximately 14 days after a new Moon, when the side of the Moon facing Earth is fully lit.
What is a full Moon?
This triangle-shaped landform is created when water slows down at the mouth of a river and drops its sediment.
What is a delta?