Geologists examine each sedimentary layer to reconstruct the environmental conditions that existed when it was deposited.
地质学家检查每一个沉积层，以重建其沉积时存在的环境条件。
• A research team coated panels with a thin, transparent cooling layer.
From a Rhetorical Synthesis question · Expression of Ideas
An article about glacier retreat opens with a description of a single ice core sample drilled from a specific glacier, then broadens to explain global patterns of glacial melt, before returning to that same ice core to describe what its layered chemistry reveals about past climate conditions.
From a Text Structure and Purpose question · Craft and Structure
The passage first explains the traditional method of estimating a whale's age using layers in its earwax plug, then describes how isotope analysis of the same layers can reveal which ocean regions the whale traveled through during each year of its life.
From a Text Structure and Purpose question · Craft and Structure
Which choice best defines “layer”?
D — Level, sheet on top of something. “layer” means level, sheet on top of something.
Which word means “level, sheet on top of something”?
C — layer. “layer” means level, sheet on top of something.
layer — level, sheet on top of something. In Chinese: 层，阶层.
layer is pronounced /ˈleɪər/.
Geologists examine each sedimentary layer to reconstruct the environmental conditions that existed when it was deposited. (地质学家检查每一个沉积层，以重建其沉积时存在的环境条件。)
stratum, coating, tier — all close in meaning to layer (level, sheet on top of something).
Yes. layer is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
layer (layer)