2. A push or pull exerted by one object on another, causing a change in motion A force that opposes the motion of an object How fast an object’s position changes with time Force – Friction – SpeedSpeed –

3. The tendency of a moving object to keep moving in a straight line or of any object to resist a change in motion An object at rest stays at rest unless acted upon by an outside force An object in motion stays in motion unless acted upon by an outside force Inertia Inertia –

4. the speed and direction of a moving object. a change in an object’s velocity over time Velocity – Acceleration –

5. Forces that cancel each other out when acting together on a single object; no acceleration takes place Forces that do not cancel each other out when acting together on a single object Balanced Forces – Unbalanced Forces –

6. the force one object applies to an object. the force which an object responds to an action. Action – Reaction –

7. the force of attraction between any two objects due to their mass the force that gravity exerts on an object More on Gravity GravityGravity – Weight –

8. mass – A measure of the amount of matter in an object. The mass of an object is related to the force required to accelerate it.

9. unbalanced forces – when forces don’t cancel each other out, there is movement. This is a result of unbalanced forces. Click on the picture for some information about unbalanced forces. Click on the picture for some information about kinds of forces.

10. momentum – momentum measures how difficult it will be to stop an object Click on the picture for some information about momentum.

21. biome – the land on Earth is divided into six major large ecosystems called “biomes” Click the picture to explore biomes link!

22. grassland – a biome in which grasses are the main plant life Click the pictures to explore grassland links!

23. taiga – a cool, mostly coniferous (evergreen) forest Click the pictures to explore taiga links!

24. tundra – the cold biome of the far north. It has permanently frozen soil, so it can’t support large plants. Click the pictures to explore tundra links!

25. desert – a sandy or rocky biome with little precipitation or plant life Click the pictures to explore desert links!

26. deciduous forest – the forest biome in which many trees lose their leaves each year Click the pictures to explore deciduous forest links!

27. tropical rain forest – hot, humid forests with much rainfall Click the pictures to explore tropical rain forest links!

28. ecosystem – all the living and non-living things in an area Click to access link!

29. abiotic factor – the non-living parts of an ecosystem water air soil light temperature minerals

30. biotic factor – the living parts of an ecosystem animals protists fungi plants bacteria

31. population – all the organisms of the same species living in an area

32. community – all the populations living in an area

33. ecology – the study of how all things in an ecosystem interact Click to access link!

34. habitat – the place where an organism lives Click pictures to access links!

35. niche – the role of an organism in its community What does the species eat? What eats the species? What environment does the species need? Is the species active by night or by day? NO TWO SPECIES CAN FILL THE SAME NICHE!

36. producer – an organism that produces oxygen and food like plants and algae

37. consumer – animals are consumers. They eat algae, plants, or other animals.

38. decomposer – organisms, such as bacteria, fungi, and worms that break down dead plants and animals into useful things like minerals that enrich the soil.

39. food chain - a group of living things that form a chain in which the first living thing is eaten by the second, the second is eaten by the third, and so on

40. food web – n. a group of food chains in an ecosystem that are connected

41. herbivore – n. an animal that eats only plants

42. carnivore – n. an animal that eats only the flesh of other animals

43. omnivores – n. plural of omnivore; an animal that eats both animal flesh and plants

44. predators – n. plural of predator: an animal that hunts and kills others animals for food

45. prey – animals that are hunted for food.

46. scavenger – n. an animal that feeds on other animals

47. symbiosis – a relationship between two living things that lasts over a period of time Click here to enter web site!

48. mutualism – when a relationship between two kinds of organisms benefits both of them Click here to enter web site!

49. parasitism – when an organism lives on or in another organism and may harm that organism. Click here to enter web site!

50. commensalism – when an organism benefits from another organism without harming or helping it. Click here to enter web site!

53. You can calculate volume by multiplying the length of an object times its width times its height.

54. You can also calculate volume by water displacement: If the water in the graduated cylinder starts at 200 mL, and goes up to 300mL when you add a coin, you can tell the coin’s volume must be????

56. Click the picture for a cool tutorial on mass vs. weight. Click the box below to calculate your weight on other planets.

58. http://www.edinformatics.com/math_science/ density.htm

60. Click the picture below to watch a video of an experiment that brings everything together – air pressure, density, and volume.

62. Click the picture below to do an online lab and test objects to see if they will float. An object will float if it is less dense than the liquid in which it is placed.

63. Click the picture below to watch a video on buoyancy.

69. limiting factor – anything that controls the growth or survival of a population predators camouflage food sources predators

70. carrying capacity – the maximum population size that the resources in an area can support

71. endangered species – a species that is in danger of becoming extinct Click here to enter the link

72. extinct – a species that has died out completely Click here to enter the link

73. threatened species – a species that may become endangered

76. cold front – cold air moves in under a warm air mass. Cold fronts often bring brief, heavy storms. There may be thunderstorms and strong winds. After the storm, the weather is usually cooler and drier.

78. warm front – warm air moves in over a cold air mass. Warm fronts often bring light, steady rain of snow. The precipitation may last for days. Winds are usually light. Warm front may also bring fog – stratus clouds that form near the ground. Afterward the weather is usually warmer and more humid.

81. warm fronts vs. cold fronts

82. thunderstorm – the most common type of storm

84. tornado – a violent whirling wind that moves across the ground in a narrow path

86. hurricane – a very large swirling storm with very low pressure at the center

89. storm surge – a great rise of the sea along a shore