What is magma? How does magma differ from lava?
What will be an ideal response?
Magma is molten rock occurring within Earth's crust. Lava is molten rock at or above the surface of Earth's crust.
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Which of the following is true about where earthquakes occur?
A) Earthquakes are randomly distributed across most of Earth. B) Earthquakes mostly occur away from plate boundaries. C) Deep and intermediate-depth earthquakes occur near subduction zones. D) Deep earthquakes are most common near rising mantle plumes.
Which of the following would be the initial ecological consequence of falling water tables?
A) loss of agricultural irrigation water B) lack of drinking water C) loss of mammals D) loss of permanent wetlands E) loss of bird species
Which of the following statements about our global food supply is true?
A) We currently have a deficit in our global food supply, and the deficit is expected to worsen over the next 40 years. B) New developments in organic farming and genetically modified crops are expected to relieve our current deficit in global food supply. C) To avoid a deficit in our global food supply, food production will have to increase faster over the next 40 years than it has over the past 40 years. D) The surplus in our global food supply is expected to provide us with a "cushion" as our global population increases to 9 billion people by the middle of the 21st century.
When considering the solubility of a particular solute in a particular solvent the term "like dissolves like" generally refers to which of the following properties?
A) formula weight B) molecular polarity C) both a and b D) neither a nor b