People who regularly move from place to place.
NOMADS
These have been found in caves all over the world.
PAINTINGS
Long periods of cold that affected all of Earth.
ICE AGES
Gradually, this replaced hunting and gathering as the main source of food. (F, 7 letters)
FARMING
The first civilizations developed in these areas.
RIVER VALLEYS
Name for the earliest period of human history.
THE STONE AGE
Greek for "Old Stone"
PALEOLITHIC
As ice sheets grew larger, the level of this was lowered.
SEA LEVEL
During the Neolithic Age, people began to tame animals for human use. (D, 11 letters)
DOMESTICATE
Early civilization existed along this river in China.
YELLOW RIVER
A hard stone with sharp edges used to make tools like scrapers and axes.
FLINT
Method of getting food that Paleolithic people used.
HUNTING AND GATHERING
During the cold Ice Ages, people learned to make warmer clothing using these.
ANIMAL FURS
Agriculture allowed this to grow at a faster rate. (P, 10 letters)
POPULATION
Egyptian civilization developed along the banks of this river.
NILE RIVER
A form of government led by a king or a queen.
MONARCHY
These were crafted from small, sharp animal bones.
NEEDLES
Thick sheets of ice covered these three continents in the Northern Hemisphere.
NORTH AMERICA, EUROPE, ASIA
More than enough, or extra. (S, 7 letters)
SURPLUS)
Early systems of writing used these instead of letters.
SYMBOLS
A type of stone that gives off sparks when struck against another rock, and can be used to start a fire.
IRON PYRITE
This is how we think early people communicated. (Two ways)
SOUNDS and PHYSICAL GESTURES
Low sea levels created a strip of dry land connecting these two continents. (At the Bering Strait)
ASIA and NORTH AMERICA
Since fewer people were needed to farm, this occurred for the first time. (S, 14 letters)
SPECIALIZATION
This area, which had an early civilization, comes from Greek words meaning "land between the rivers"
MESOPOTAMIA