What is the primary reason for the inside of Earth being hot?
A) No heat is being generated, but Earth's outer layers have prevented the escape of heat trapped during the planet's initial formation.
B) The decay of radioactive elements is creating heat in Earth's inner layers.
C) The nuclear process of fusing hydrogen into helium like that found in stars is at work in Earth's interior.
D) Huge quantities of oil and natural gas occasionally burn deep within Earth.
B
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Cloud-to-ground lightning begins within the cloud when the localized electric potential gradient exceeds ____ volts per meter along a path perhaps 50 m long
a. 300 b. 3,000 c. 30,000 d. 300,000 e. 3 million
What is important to know about the evolution of invertebrate phyla? What will be an ideal response?
Bacteria are the largest (i.e. number of species) group of organisms
Indicate whether the statement is true or false
The convex upper portion of a typical slope is called a
A) pediment. B) debris slope. C) waxing slope. D) free face.