This shows grade level based on the word's complexity.
D layer
Save This Word!
This shows grade level based on the word's complexity.
noun
the lowest region of the ionosphere, characterized by mounting electron and ion density: exists, during the day only, from about 43 to 50 miles (70 to 80 km) altitude.
QUIZ
QUIZ YOURSELF ON "WAS" VS. "WERE"!
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
âWasâ is used for the indicative past tense of âto be,â and âwereâ is only used for the subjunctive past tense.
Compare D region.
Origin of D layer
First recorded in 1930â35
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
How to use D layer in a sentence
Scientific definitions for D layer
D layer
See D region.
The American HeritageÂź Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.