Due to the PSA and other conservation efforts, forest cover within Costa Rica has recovered since 1983 to cover how much land today?
What will be an ideal response?
53%
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The straight-line acceleration of winds above a cyclone is called ____________________ ____________________
Fill in the blank(s) with correct word
In eukaryotes how many polymerases catalyze transcription?
A) 1 B) 2 C) 3 D) 4
Chemical weathering processes are particularly effective on limestone landscapes, forming
A) pressure-release jointing. B) hydrolysis plains. C) exfoliation domes and arch-like forms. D) karst topography.
What causes the greenhouse effect?
a) Atmospheric gases, such as carbon dioxide, absorb sunlight, causing the atmosphere to heat up. b) The oceans absorb solar energy and trap heat, making the Earth warmer. c) Greenhouse gases lead to polar ice cap melting, making the Earth warmer. d) Sunlight is absorbed by the Earth's surface, reradiated as infrared energy, and absorbed by atmospheric gases. e) Greenhouse gases absorb ozone, leaving the Earth unprotected from ultraviolet radiation.