The Doppler radar used in weather forecasting measures the direction and speed, or velocity, of objects such as drops of precipitation. This is called the Doppler Effect and is used to determine whether movement in the atmosphere is horizontally toward or away from the radar, which aides in weather forecasting.
I'm pretty sure it would be A.
Answer:
The correct answer is A or 1 or the first answer choice
<span>the intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.
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Precambrian period ends at the first sign of complex life about 540 million years ago. About 540 million years ago, the Precambrian age came to an end with the appearance of complex life.
<h3>What about Precambrian period?</h3>
- The vast majority of earth's history occurs during the Precambrian period, which began with the planet's birth approximately 4.5 billion years ago and ended with the appearance of complex, multi-celled life forms nearly four billion years later.
- The earth's surface at this time resembled traditional depictions of Hades: there were craters everywhere and oceans of liquid rock.
- All across the place, volcanoes erupt, while asteroids and boulders continue to fall from orbit.
- In the first great extinction, which occurred around 650 million years ago, 70% of the dominating Precambrian flora and animals perished.
- Three major groups that have survived to the present day are represented in the fossil record of multi cellular organisms from the Precambrian.
- These include sponges, cnidarians (such as corals, jellyfish, and sea anemones), and annelids, or segmented flatworms.
Learn more about Precambrian period here:
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