Question

4. The Stone Age lasted for a very short time.
5. Fire was discovered in the Stone Age.​

Answer 1

Answer:

4. no, stone age was last for very short time

5. yes fire was discovered in the stone age

Answer 2

Answer

HISTORY SCIENCEWHEN DID HUMANS DISCOVER FIRE? THE ANSWER DEPENDS ON WHAT YOU MEAN BY 'DISCOVER'

When Did Humans Discover Fire? The Answer Depends on What You Mean By 'Discover'

A Boy Blowing on a Firebrand to Light a Candle, by Godfried Schalcken, 1692 - 1698. Oil on canvas. Purchased with the assistance of the Art Fund and the National Heritage Memorial Fund 1989 .

A Boy Blowing on a Firebrand to Light a Candle, by Godfried Schalcken, 1692 - 1698. Oil on canvas. Purchased with the assistance of the Art Fund and the National Heritage Memorial Fund 1989" . (Photo by National Galleries Of Scotland/Getty Images) National Galleries of Scotland/Getty Images

BY ANDREW C. SCOTT

JUNE 1, 2018 10:00 AM EDT

Fire is one of the most important forces on Earth. The use of fire by humans has long been considered as a defining property of intelligence, separating us from other animals. The exact timing of the discovery and use of fire by humans has been a subject of continuing research, yet perhaps two questions have, until now, received little attention: What was fire on Earth like before humans appeared? And what experience of fire could early humans have had?

Three main components are needed for fire. First, there must be a fuel to burn. Second, oxygen must be available — after all, combustion is essentially an oxidation process that gives off heat and light. And third, there must be a heat or ignition source that allows the fire to begin. We would not expect fire on a barren Earth; there must be plant life on land that can provide a fuel source. And vegetation fires can’t occur until the oxygen level in the atmosphere has reached around 15%. (It is 21% today.) This is why we smother a fire with a blanket or sand, pump carbon dioxide on it, or even flood it with water to extinguish it — to cut off the oxygen. The main sources of ignition before humans appeared were lightning strikes

Explanation:

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