Acid
Is a substance that is sour or bitter to taste. It is corrosive and will burn. It rates a 0.0 to a 6.9 on the pH-scale.

Acid Rain
Is the product of polluted particles in the air mixing with precipitation and forming an acid.

Adaptation
Adaptations are special characteristics that help a plant or animal survive. There are physical adaptations (size, shape, body temperature...) and behavioral (different ways of reacting) adaptations that help animals survive.

Arctic Haze
Is a phenomenon that occurs most often in the winter in the Arctic. It occurs when air pollution flows over the North Pole and settles over Northern Alaska.

Axis
The point around which an object rotates.

Base
Is a substance that tastes brackish. It is corrosive and will burn. It rates a 8.0 to a 14.9 on the pH-scale.

Carbon Dioxide
Carbon Dioxide is a gas, made up of 1 part Carbon and 2 parts oxygen(CO₂). Carbon dioxide is the gas we breathe out and trees breathe in.

Corrosion
The process of chemically eroding away.

Ecosystem
An ecosystem is a community of living and non-living elements and their relationships to each other. 

Energy
It is the ablitiy to do work. The sun provides plants with the energy  to perform photosynthesis. Energy can be used and provided by both living and non-living things. The wind gives water the energy to make waves.

Erratics
Erratics are large boulders left behind by glaciers. The boulders were moved by the glaciers from a far away distance.

Field Guide
A field guide is a book that gives descriptions to help identify a plant, animal, rock or other item.

Global Warming
This is the theory that the average temperature is rising due to pollution in the atmosphere.

Greenhouse Gas
Carbon dioxide is a greenhouse gas. It is called a greenhouse gas because it is forming a heat trapping layer in the atmosphere like the glass of a greenhouse traps heat.

Habitat
A habitat is a place where an animal can find food, shelter, water and space to live in.

Ice Age
An ice age is a time when the average temperature of the world cools down enough that cool summers and long winter occur. More snow falls than melt when the temperatures are like this. When more snow falls than melts glaciers of many sizes form. The last time this happened was about 12,000 to 10,000 years ago.

Kettle Marsh
A kettle march forms when a large chunk of ice is left behind by a glacier. The weight of the ice causes the ground to sink under it and the melting water fills the hole o make a marsh.

Lichen
Lichens are an algae and a fungus living together as a small community. The algae produces food for the algae and the fungus. The fungus can hold water for both the algea and the fungus.

Living Environment
The living environment is the part of the ecosystem that is made of living things such as plants, animals, and fungi...

Moraine
Is a deposit of rock and soil left behind by a glacier.

Neutral
Neutral is neither an acid or a base. It rates a 7 on the ph-scale.

Non-living Environment
The non-living environment is the part of the ecosystem that is made of non-living things such as rocks, water, and air...

North Pole
The northern most point on earth at it axis.

Oxygen
Oxygen is an element on the periodic table of elements. It is also the gas we need to breathe. Trees breathe out oxygen.

pH-scale
pH-scale is a scale that goes from 0 to 14 and measures acids and bases.

Photosynthesis
Photosynthesis is the process plants go through to produce sugar for food. 

Retreating
A retreating glacier is one that is melting and no longer growing.

Rotation
The movement of an object around its axis.

Revolution
The movement of one object around another.

Snags
A snag is an old, standing dead tree.

Solar Energy
The energy received in the form of heat radiation from the sun.

South Pole
The southern most point on the earth at it axis.

Species
A species is a specific name given to a plant or animal. Humans are the species sapiens.

Succession
The order of restoration for an ecosystem. Plants follow a certain order that they grow back in, when growing in a place that has been disturbed by fire, construction or other land altering events. 

Successional Stages
The various stages or plant communities developed while a forest is moving toward its climax stage.

Sulfites
Sulfates are a common air pollutant released into the air by industrial plants. 

Terminal Moraine
A terminal moraine is the rock and soil deposit left behind by the toe of a glacier. Terminal moraines often form dams that hold back glacial lakes. 

Tilt
The relationship of the earth's axis to the sun. The earth is tilted at an angle of 23.5 degrees to the sun.

Transpiration
When trees release water vapor through their leaves.

U-Shaped Valley
A U-shaped Valley is formed by a glacier. It has a rounded valley bottom and steep valley walls.

Water Cycle
The water cycle is the recycling of water. An example of the water cycle would be: Water evaporates from the ocean and forms a cloud. The cloud comes over your house and cools and it rains. The rainwater runs off your roof onto the ground and into a river. The river flows out to the ocean and the water in the ocean evaporates and makes a cloud and on and on. This is just one way the water cycle can move.