What is the main cause of global warming

What weather system might be occurring if the pressure gradient decreases and fish harvests in peru are weaker than normal

What is the difference between the formation and characteristics of intrusive igneous rock and extrusive igneous rock?

If you were a casual recreational hiker with young children, which of the following trails would be least strenuous for a leisurely family outing? a. merced lake trail b. mirror lake loop trail. c. tenaya lake and tuolumne meadows trail d. el capitan trail