area undisturbed by human activity

height above sea level

- climate with cool summers and bitterly cold, dry winters

small aircraft used to fly to remote places

sudden, sometimes painful, contraction of the muscles

unconscious with lack of response

wild or disturbing activity

an instrument to measure height

a valve that regulates the supply of fuel to the engine

unclear

to burn slowly without bursting into flames

bends

make up for; correct

able to weaken or wear down

weakened or damaged

loosely-woven, screen like fabric or wire

pen or trap

protective coloring or marking

caught fire

the ability to hold

inactive, sleeping

lessened or moved away

stuck or pushed down within something solid

passage for smoke

extreme physical or mental suffering

small hills

make or become less

to pound, crush, or grind into powder or dust

attractively, because of rich growth

able to live both on land and in water

the state or fact of continuing to live or exist, typically in spite of an accident, ordeal, or difficult circumstances.

the periodic rise and fall of the water level in the oceans and other large bodies of water

a tide just after a new or full moon, when there is the greatest difference between high and low water.

a tide just after the first or third quarters of the moon when there is the least difference between high and low water.

a condition in which blood flow to part of the heart muscle is blocked, causing heart cells to die