Delaware
Planting crops and raising farm animals
agriculture
keve areas of land within a region surrounded by hills or mountains
flats
a continent that includes Canada, the United States, Mexico and Central America
North America
objects and tools used by early humans for eating, cooking and hunting
artifacts
scientists who study past human life by looking at prehistoric fossils and tools
archeologists
a shape that looks like an upside down bowl
dome
rich soil that produces a large number of crops
fertile
before written history
prehistoric
large, hairy extinct elephants with tusks that curved upwards
mammoths
strengthened
fortified
a shiny mineral with a layered structure found as small flat crystals in rocks
mica
finding the age of ancient objects by measuring the amount of carbon in them
carbon dating
spears with hooks on them for hunting whales or large fish
harpoons
open pits that provides stones for building
quarries
a group of people with a central government and common goal
confederacy
family members who are born after other family members have died
descendants
holes, or cavities, made from digging
excavations
a volcanic rock formed by the rapid cooling and hardening of lava without forming crystals
obsidian