The D-layer of the ionosphere:
A) has most of its electrons combined with positively charged ions at night.
B) lies above the E-layer.
C) is transparent to AM radio waves.
D) has no significant effect on AM radio waves.
Answer: A
You might also like to view...
Orographic precipitation requires which two physical features to occur?
A) desert and mountains B) ocean and mountains C) ocean and desert D) ocean and tropical forest E) desert and tropical rain forest
The following questions are based on Map T-10, the “Furnace Creek, California” quadrangle (scale 1:62,500; contour interval 80 feet; dotted lines represent 20-foot contours).
1. Using the graph at right, construct a topographic profile from Point A in the Panamint Range to Point B on the basin floor. Plot the index contours and any other contours needed to show key features along the profile. 2. On the topographic profile, label (a) the basin floor, (b) the alluvial fan, and (c) the mountain front.
Near Los Angeles, the sea breeze front
A) separates marine air from polluted air. B) moves farther off-shore as the day progresses. C) leads to lowering pollution in the eastern portion of the Los Angeles basin in the late afternoon. D) does not affect the concentrations of photochemically generated smog components.
Volcanic eruptions help create new land
Indicate whether the statement is true or false