| A | B |
|---|
| abyss | A deep space that seems to have no bottom. The part of the ocean that lies below 13 |
| atom | The basic building block of matter. |
| cell | Basic unit of living organisms. |
| cycle | A complete round or a series of events that are repeated in the same order. |
| element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter. |
| gas | A state of matter that has no fixed shape and no fixed volume. |
| hypothesis | An explanation based on a group of facts or observations. Written as an If.... Then.... statement. |
| invertebrate | Animals that do not have backbones. |
| kaleidoscope | An optical toy in a tube; it produces symmetrical patterns as bits of colored glass are reflected by mirrors. |
| light | electromagnetic radiation that can produce a visual sensation. |
| liquid | A state of matter that has no fixed shape but that has a definite volume. |
| marine | related to or of the sea |
| mass | Amount of matter contained in a substance. |
| microscope | An optical instrument that magnifies the image of small objects. |
| nonvascular | plants lacking vein-like structures through which water |
| ocean | A large body of water constituting a principal part of the hydrosphere. |
| opaque | a material that doesn't allow light to pass through |
| plate tectonics | A theory that explains the movement of the Earth's continents. Also called continental drift. |
| prism | A piece of transparent material that bends light and separates it into the colors of the rainbow. |
| rock | natural solid material made of one or more minerals |
| science | The study of nature and the physical world by testing |
| solid | A state of matter that has a definite shape and a definite volume. |
| sound | a kind of vibration that travels through a substance |
| spectrum | Spreading of light by frequency (or wavelength) so that each one appears at a different position |
| vascular | plants that contain vein-like structures through which water nutrients and food are transported throughout the plant |
| vertebrate | Animals that have backbones. Mammals |
| wave | Movement of energy through water. They are caused by wind. |
