7th grade science 5 Flashcards
Crater
Depression formed by impact of meteorites or comets; the more craters in a region, the older the surface
Lunar eclipse
Occurs during a full moon, when the Sun, Moon, and Earth line up in such a way that the Moon moves into Earth’s shadow
Moon phases
Changing views of the moon as seen from Earth,
which are caused by the moons revolution around the earth
Solar eclipse
Occurs during the new Moon, when the sun, the moon, and earth are lined up in a specific way and the earth moves into the moon’s shadow
Asteroid
Small, rocky objects found in the astroid belt between the orbits of Jupiter and Mars
Astronomical unit
Unit used to measure distance in the solar system one AU equals 150,000,000 km
Comet
Space object made a rocky particles of ice that forms a tail when orbiting near the sun
Nebula
Out of gas and dust particles and interstellar space
Cell
The smallest unit of an organism that carries on the functions of life
Homeostasis
The regulation of an organisms internal condition that keeps it alive despite changes in its environment
Organism
Any living thing
Binomial nomenclature
The two word scientific naming system used to name organisms
Genus
A group of similar species
Domain
The largest classification
Phylogeny
History of how an organism has changed over time
Cell membrane
The protective layer around the cell, which controls what happens between the cell and its environment
Cell theory
The summary of ideas that all organisms are made out of one or more cells; the cell is the basic unit of organization; and all cells come from other cells that already exist
Cell wall
A tough rigid outer covering that protects the cell and gives it shape
Chloroplast
A green organelle that makes food in plant cells
Cytoplasm
Gelatin like material inside every cell
Endoplasmic reticulum
A series of folded membranes in which materials can be processed and move around inside the cell
Golgi bodies
Stacks, flattened membrane that sort proteins and other cellular substances and package them into membrane-bound structures called vesicles
Mitochondrion
An organelle where energy is released from breaking down food into carbon dioxide and water
Nucleus
Usually the largest organelle in the cell that directs all cell activities
Organ
A structure made up of two or more different types of tissues that work together
Organ system
A group of organs that work together to perform a function
Organelle
A structure within the cytoplasm of a eukaryotic cell
Ribosome
A small structure where a cell makes its own proteins
Tissue
A group of similar cells that work together to do one job
