A disturbance or shaking of the Earth's surface due to underground movement.
A wavelike disturbance in the tropical easterly winds that usually moves from east to west. Such waves can grow into tropical depressions.
The vertical gridlines on a map so called because their numeric value increases from west to east.
Tidal currents that are moving away from the beach.
Measuring distances from objects by sound.
The cutting off of light (total or partial) from one celestial body by another.
A community of organisms interacting with one another and with the environment in which they live.
Water that flows from a sewage treatment plant after it has been treated.
A nutrient parcel attached to a seed which insects eat.
The height of a point on the Earth's surface above sea level.
The best thing to cook on if using a wood fire. When the flames have died down and the part-burnt wood glows orange or white, it is the most efficient heat to cook on.
A shoreline resulting from a rise in land surface elevation relative to sea level.
The internal organs, especially the intestines; viscera.
All the living and nonliving things that are around a living thing.
An imaginary circle around the earth, halfway between the north and south poles; the largest circumference of the Earth.
The process in which a material is worn away by a stream of liquid (water) or air.
A boulder that has been carried from its source by a glacier and deposited as the glacier melted. Thus, the boulder is often of a different rock type from surrounding types.
A long cliff or steep slope separating two comparatively level or more gently sloping surfaces and resulting from erosion or faulting.
An estuary is where a river meets the sea or ocean,where it empties into a large body of water.
Estimated time of arival.
The change in form that water goes through when it turns from a liquid to a gas.
The water lost from an area through the combined effects of evaporation from the ground surface and transpiration from the vegetation.
An external skeleton that supports and protects the animal's body.