What was the Cambrian explosion?
A. a time when many different types of creatures appeared on Earth
B. a time when a meteorite collided with the center of a supercontinent, melting all the glaciers
C. a meteorite impact that struck the north coast of the Yucatan Peninsula of Mexico
D. a large volcano that went off in Wales, which the Romans called Cambria
Answer: A
You might also like to view...
Of the following choices, the best indicator of drought is
A) soil-water use. B) soil-water recharge. C) height of the saturated zone. D) deficit.
The Earth's electric field carries about ________ times the current of a North American home
A) 2 B) 10 C) 100 D) 1,000
In the process of hydration, the entire water molecule is added to the mineral structure, stretching the crystal lattice. Which type of weathering would this process describe: physical or chemical? Why?
What will be an ideal response?
Which feature is responsible for 90% of the Earth's volcanic activity?
A. Continental rise B. Oceanic trenches C. Oceanic ridges D. Continental shelf E. Abyssal plain