True or False: Ozone concentrations and exposure continue to decrease in the Grand Canyon.
False; Ozone concentrations and exposure continue to rise in the Grand Canyon.
100
True or False: Volcanic eruptions over the past 2 million years have sometimes resulted in the formation of huge lava dams.
True; There are lava dams in the Grand Canyon created by volcanic eruptions.
100
True or False: The Colorado River’s water is filled with sand and soil particles.
False; the Colorado River's water is clear because the sand and soil particles are trapped in Lake Powell.
100
True or False: Generally temperatures increase 5.5 degrees Fahrenheit with each 1,000 feet loss in elevation so the highest temperatures are found at the lowest elevations in the canyon.
True; the bottom of the Grand Canyon is warmer than the rims because temperatures increase with elevation loss.
200
What are the four main things air pollution can potentially damage?
The four main things air pollution can potentially damage are natural resources (water, fish, vegetation), plants, animals, and ecological processes.
200
Why is the Grand Canyon more susceptible to erosion?
The Grand Canyon is more susceptible to erosion because the plants inhabiting the canyon have very shallow roots. When flash floods occur, the plants are washed away and cannot hold soil down, which causes erosion.
200
What are three characteristics of Grand Canyon tributaries?
Three characteristics of Grand Canyon tributaries are hardness, high alkalinities, pHs around 8.5, and also dissolved oxygen levels in the range of healthy streams.
200
What are the possible impacts of wet thunderstorms in comparisons to the impacts of dry thunderstorms (with lightning) on the Grand Canyon?
Wet thunderstorms can cause flash floods in the Grand Canyon’s tributaries while dry thunderstorms with lightening can cause forest fires in the Grand Canyon.
300
What is the average natural visibility range from scenic vistas (with and without pollution)?
170 without pollution to 120 miles with pollution
300
What is the name of the creek that helped form Slide Rock?
Oak creek
300
Why aren’t the native fish of the Colorado River stimulated to spawn seasonally?
The native fish of the Colorado River aren't stimulated to spawn seasonally because the range of the Colorado River’s flows and temperature doesn’t have many variations.
300
What do the deep canyons of the Grand Canyon influence?
Deep canyons of the Grand Canyon influence solar heating and air circulation, which creates many different microclimates throughout the Grand Canyon.