What makes the narrow, rotating air column or vortex of a tornado visible?
What will be an ideal response?
Either the condensation of water vapor (which forms a cloud) or the debris suspended in the air, or some combination of these.
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What is the elevation of Point A?
The question is based on this contour line map with elevations shown in feet.
• North is to the top of the map.
• Streams are shown with dashed lines.
• A graphic scale for measuring horizontal distances is shown below the map.
• Estimate elevations between contour lines to the nearest half-contour interval; assume that the top of a
hill is one-half-contour interval higher than the highest contour line shown.
What will be an ideal response?
Discuss how Silurian and Devonian reefs differed from Cambrian reefs. What will be an ideal response?
What are the requirements for a rock body to serve as a reservoir rock for hydrocarbons? What will be an ideal response?
No-till farming would be most beneficial for farmers ________
A) who typically experience minimal soil erosion B) using contour strip cropping C) who plant a cash crop every third year D) with steeply sloped fields E) whose cropland is in the Conservation Reserve Program