a slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles.
What is a glacier?
100
Naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice, and/or by the force of gravity acting on the particles.
What is sediment?
100
Small river that flows into a larger river.
What is a tributary?
100
Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
What is an isotope?
200
Large chunks of granite that move across Earth's surface over time.
What are continents?
200
This continent holds the largest glacier on Earth.
What is Antarctica?
200
Part of the ocean floor right off the coast that is relatively shallow with lots of heavy sediment (like sand) piled up.
What is a continental shelf?
200
Lakes disappear over time when they fill up with this.
What is sediment?
200
Differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in heritable traits of a population over time.
What is natural selection?
300
A low lying area that fills with sediment over time.
What is a basin?
300
The only continent without glaciers.
What is Australia?
300
Area between the continental shelf and the continental rise with regular turbidity currents.
What is the continental slope?
300
Area of land from which water flows into a single river.
What is a drainage basin?
300
An interstellar cloud of dust, hydrogen, helium and other ionized gases.
What is a nebula?
400
Underwater sediment landslide.
What is a turbidity current?
400
Large, glacier carved lakes in the United States.
What are the Great Lakes?
400
Convergent boundary and subduction zone-- these are the deepest part s of the ocean.
What is a trench?
400
While most rivers reach the ocean, some rivers empty into these.
What are salt lakes?
400
Chemical reaction responsible for the existence of free oxygen in Earth's atmosphere.
What is photosynthesis?
500
A man made lake.
What is a reservoir.
500
A piece of rock that differs from the size and type of rock native to the area in which it rests. They are carried by glacial ice, often over distances of hundreds of kilometres.