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What is the definition of an impression fossil?
Sometimes a fossil is formed when the organic matter is impressed in clay or some similar substance. The organic substance rots away, but the impression it left remains, and if the clay which holds the impression petrifies, it becomes a fossil.
What percent of geologic time is represented by abundant fossil evidence?
The planet Earth is about 4,600 million years old. Fossil evidence becomes abundant in the geological record in the Cambrian Era, which was about 550 million years ago (when hard shelled animals appeared) Therefore (550/4600)*100 = roughly 12% of Geological time contains abundant fossil evidence. However, please note that (non abundant) fossil evidence goes back about 3600 million years, (3600/4600)*100 = roughly 73% of Geologic time.
What is fossil succession?
Fossil organisms succeed one another in a definite and determinable order, and therefore any time period can be recognized by its fossil content. -organisms evolve, and organisms become extinct. Proposed by William Smith late 1700's and early 1800's
What is in a batery?
WHAT'S INSIDE A BATTERY?While there are many different types of batteries, the basic concept by which they function remains the same. When a device is connected to a battery, a reaction occurs that produces electrical energy. This is known as an electrochemical reaction. Italian physicist Count Alessandro Volta first discovered this process in 1799 when he created a simple battery from metal plates and brine-soaked cardboard or paper. Since then, scientists have greatly improved upon Volta's original design to create batteries made from a variety of materials that come in a multitude of sizes.Today, batteries are all around us. They power our wristwatches for months at a time. They keep our alarm clocks and telephones working, even if the electricity goes out. They run our smoke detectors, electric razors, power drills, mp3 players, thermostats -- and the list goes on.
When use happen to in a sentence?
Did you happen to watch the Super Bowl yesterday?If you happen to see Dad, could you remind him about the party?What will happen to those children if their mother goes to prison?I cut my finger on that new, sharp knife and I don't want that to happen to you.
