Which of the following best describes an estuary?

partly enclosed area with saline water
partly enclosed area with brackish water
completely enclosed area with brackish water
completely enclosed area with saline water

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

Which statement best describes the he properties of iconic compounds ?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?