The oldest known rock found on Earth is dated at
A. over 4 billion years old.
B. 500 million years old.
C. 1 million years old.
Answer: A
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A(n) ____________________ is an instrument that indicates both wind speed and direction. It consists of a bladed propeller that rotates at a rate proportional to the wind speed. Its streamlined shape and a vertical fin keep the blades facing into the wind. When attached to a recorder, a continuous record of both wind speed and direction is obtained
Fill in the blank with correct word.
Oceanographers are studying the thermohaline currents to determine ________
A) whether global climate change may slow or alter their path B) whether fresh water is more dense than saltwater C) whether they could be replaced with artificial currents if damaged by changing temperatures D) if warm water from polar and glacial melt is affecting the chemistry of the currents E) whether they are becoming more acidic
The development of a hardpan of clay in a subsoil can restrict the downward percolation of water through the soil horizons
True False Indicate whether the statement is true or false
The pH value of a solution decreases with increasing concentrations of hydrogen ions.
Answer the following statement true (T) or false (F)