What is magnetic polarity? What role did it play in the generation of ideas regarding sea-floor spreading?
What will be an ideal response?
The magnetic polarity is the geographic orientation of the North and South Poles. Magnetic stripes develop as new crust is added to the ocean floor at mid-ocean ridges and cools, becoming magnetized according to the magnetic field that exists at the time. As this material moves away from the axis, new sea floor is created, and its magnetization may be reversed if Earth's magnetization has reversed polarity in the intervening time.
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There are about 3.5 million homeless people in the United States currently. About how many homeless people are there in Washington, D.C?
A) 3,000 B) 14,000 C) 60,000 D) 100,000
The Earth has ________ for the past 2 million years
A) gradually cooled B) cycled between hot and cold C) stayed the same temperature D) slowly frozen then quickly thawed E) gradually warmed
What is the leading source of renewable energy worldwide?
A. hydropower B. geothermal energy C. solar-cells D. biomass E. biodiesel
Scientists openly publish details of their methods and models and continually question their own and other's data and results in a process known as _____________________.
Fill in the blank(s) with the appropriate word(s).