Which of these protects earth from harmful radiation when in the stratosphere but is a pollutant at lower altitudes? carbon oxygen ozone hydrogen

Distance that the transcontinental railroad covered from omaha to san francisco.

In wegener’s evidence for continental drift, continents were proposed to fit together, such as the east coast of south america with the west coast of europe. east coast of africa. west coast of greenland. lower west coast of africa.

The ratio of the measures of the three angles in a triangle is 14: 15: 11 find the measures of the angles