English Language · English
Which choice most effectively uses data from the table to complete the example? Ablation Rates for Three Elements in Cosmic Dust, by Dust SourceElementSPCASTHTCOCCiron20%28%90%98%potassium44%74%97%100%sodium45%75%99%100% Earth’s atmosphere is bombarded by cosmic dust originating from several sources: short-period comets (SPCs), particles from the asteroid belt (ASTs), Halley-type comets (HTCs), and Oort cloud comets (OCCs). Some of the dust’s material vaporizes in the atmosphere in a process called ablation, and the faster the particles move, the higher the rate of ablation. Astrophysicist Juan Diego Carrillo-Sánchez led a team that calculat ed average ablation rates for elements in the dust (such as iron and potassium) and showed that material in slower-moving SPC or AST dust has a lower rate than the same material in faster-moving HTC or OCC dust. For example, whereas the average ablation rate for iron from AST dust is 28%, the average rate for ______blank
- 1sodium from AST dust is 75%.
- 2iron from HTC dust is 90%.✓
- 3sodium from OCC dust is 100%.
- 4iron from SPC dust is 20%.
Correct answer
iron from HTC dust is 90%.
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