Why is it important that people with heart problems (hypertension) not drink softened water? What will be an ideal response?
Dissolved calcium (Ca) and magnesium (Mg) ions cause water to be “hard.” A water softener
exchanges sodium ions (Na) for Ca and Mg ions in the water using zeolite minerals. Water softeners
increase the sodium content of water. Sodium is known to be bad for persons with heart problems
(hypertension) so these people are on a low-sodium diet.
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Which of the following is not true of deep ocean trenches?
A) They are geologically very stable. B) They are long and narrow depressions. C) They may act as sediment traps. D) They are sites where plates plunge back into the mantle.
The annual probability of flooding is the inverse number of the corresponding recurrence interval.
a. true b. false
When Pablo and Johanna write up their initial proposal, the instructor will probably ________
A) tell them to start over–it would take many years to do such a study B) tell them that they need at least 100 dogs to do the study C) give them an A for thoroughness, and allow them to proceed with the experiment D) tell them they have a serious problem with the proposal, but it is fixable if they are willing to take care of more dogs Read the following scenario, and answer the questions below. THE EXPERIMENT: Researchers wanted to determine whether pesticide Z is effective at killing grasshoppers that typically invade cornfields. Two 10-acre cornfields located 1 mile apart were chosen. The cornfield to the west was sprayed only with water. The cornfield on the east received the same amount of water with a 10% solution of pesticide Z. The number of grasshoppers in the fields was recorded every week for 10 weeks. RESULTS: The number of grasshoppers in the west field treated only with water doubled after 10 weeks. The number of grasshoppers in the east field treated with pesticide Z declined by 50% after 10 weeks.
What is the term for an intrusive rock body that is planar (flat like a sheet of paper_ but discordant (cuts across the host rocks like knife blade on pages of a book)
What will be an ideal response?