What are two reasons that Earth lost its first atmosphere of hydrogen and helium? What will be an ideal response?
1. Hydrogen and helium are extremely light elements, and Earth’s gravitational force was not
strong enough to hold onto them.
2. Earth had no magnetic field. Therefore, it was subjected to blasts of solar wind which
would have carried off the hydrogen and helium.
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Which pair of variables below are not related in a positive feedback loop?
A. snow cover on Earth's surface; global average temperature B. population of rabbits and bobcats C. water vapor and air temperature D. population of hummingbirds and population of flowers
This volcano is relatively small and composed of volcanic cinders. What kind of volcano is it?
A) Cinder cone
B) Shield volcano
C) Composite volcano
D) Volcanic dome
E) Caldera
The world's largest urban areas are generally called "metropolises."
Indicate whether the statement is true or false.
Describe the evolution of amphibians in the Paleozoic. What will be an ideal response?