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Crossword clues

Solve these clues to fill the grid.

To take up mentally
1 Across
An oxide containing two atoms of oxygen in the molecule
4 Across
The outer boundary of an artifact or a material layer constituting or resembling such a boundary
8 Across
How plants make food from sunlight
10 Across
Layer of air around the Earth
12 Across
Solid homogeneous inorganic substances occurring in nature having a definite chemical composition (plural)
13 Across
The responsive adjustment of a sense organ to varying conditions
14 Across
The power to do work or make things move
16 Across
Gas in the air that we need to breathe
2 Down
Any of a group of green pigments found in photosynthetic organisms
3 Down
An abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous ___
5 Down
The main organ of photosynthesis and transpiration in higher plants
6 Down
Clear liquid we drink that falls as rain
7 Down
The metabolic processes whereby certain organisms obtain energy from organic molecules
9 Down
Fortification consisting of a strong fence made of stakes driven into the ground
11 Down
A part of an animal that has a special function or is supplied by a given artery or nerve
15 Down

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