ESCI 1006 || A+ Graded Already.

Q1: In calculating the size of Earth, Eratosthenes used assumption or knowledge that: Select one: a. Earth is a sphere b. Sun is far away, so that sun rays reach Earth in parallel c. Sun shone directly above a deep well d. Sun cast a slight shadow at some distance from the deep well e. All of the above correct answers e. All of the above Q1: There were multiple estimates for the age of Earth. They include: Select one: a. The age is about 6000 years according to a reading of the Bible b. Radiometric dating indicates the age to be about 4.5 billion years c. The age is 20-40 million years according to Lord Kelvin's analysis of geothermal gradients d. The age is 90-100 million years, which is the time required for the oceans to accumulate as much salt as they do now e. All of the above correct answers e. All of the above Q1: Darwin was concerned about Lord Kelvin's estimate of Earth's age, because it was too short to explain by his Theory of Evolution the observed diversity of species that existed Select one: True False correct answers True Q1: Radiochemistry is used to determine the age of Earth. Which of the following is true? Select one: a. Radioactive atoms have a 50-50 probability of decaying every half life b. Radiocarbon is a type of radioactive element used to date artifacts c. The age of Earth according to radiochemistry is about 4.5 billion years d. A sample used for any type of radiometric dating must be a "closed" system (i.e., radioactive element being measured may not be introduced to the sample subsequent to its formation) e. All of the above correct answers e. All of the above Q1: Match the processes with the planets: 1.Gravitational force was too weak to retain "water" molecules 2.Had the right size and distance from the sun to retain water 3.Being close to the sun, the surface temperature was too high. This allowed "water" molecules to reach high altitudes and eventually escape to space a.Earth b.Venus