1.  HYDROSPHERE—all the water on Earth. Earth is about 70% water

2.  BIOSPHERE- all the living organisms on Earth

3.  ATMOSPHERE- the blanket of gases that surround the Earth. Most abundant gas is nitrogen (78%) and second most abundant is oxygen (21%).

4.  LITHOSPHERE- all the Earth (soil, rocks, layers of Earth) and its crust

5.  ROTATION- the spinning of Earth on its axis

6.  REVOLUTION- the Earth going around the sun in its orbit

7.  TILT- the slanting of Earth on its axis

8.  ELLIPTICAL- “oval shaped”

9.  ORBIT- the moving of one object around another

10.  WANING- “losing light”

11.  WAXING- “gaining light”

12.  LUNAR- “moon”

13.  SOLAR- “sun”

14.  GRAVITY- the pull of one object on another

15.  MASS- the amount of matter in an object

16.  WEIGHT- the amount of gravitational pull on an object

17.  TIDE- the rising and falling of the ocean water

18.  EQUATOR- 00 latitude.

19.  EQUINOX- both hemispheres having equal amounts of sunlight

20.  EVAPORATION- going from a liquid to a gas

21.  CONDENSATION- going from a gas to a liquid

22.  ASTRONOMY- the study of the solar system (space)

23.  COMET- a ball of frozen gases with a tail that orbits the sun

24.  ASTEROID- a ball of rock that is in a belt between Mars and Jupiter

25.  When water evaporates and becomes water vapor. Then it condenses into clouds and finally becomes precipitation that falls back to Earth.

26.  Any answer will do here as long as you can show how the hydrosphere, biosphere, atmosphere and lithosphere connect in some way.

27.  The slanting or sloping of Earth. Our tilt is 23 ½0

28.  Because of the tilt of Earth and also its revolution around the sun

29.  Gravity and inertia

30.  It takes 365 ¼ days for the Earth to revolve around the Sun one time. Those ¼ of a day add up to one complete day and then that one day is added to our calendar every four years.

31.  24 hours or 1 complete rotation

32.  365 ¼ days or 1 complete revolution

33.  Winter solstice----December 20-22

Vernal Equinox—March 20-22

Summer Solstice—June 20-22

Fall (Autumnal) Equinox—September 20-22

35.  WAXING—light is growing or getting bigger; WANING—light is going away or getting smaller

36.  The moon’s revolution and rotation happens at the same speed

37.  27-28 days

38.  The gravitational pull of the Moon

39. 

41.  See below

42.  See below