The Earth has been though many changes that have affected all of Earth’s spheres: the biosphere, geosphere, hydrosphere, and atmosphere. Geologists use clues from Earth’s history to determine the age. Scientists estimate the age of the Earth to be 4.6 billion years old. What evidence do scientists have that would help them make that estimation? Please write your response in complete sentences.

Ssignment 4: contemporary issues in modern police operations and the policing due week 10 and worth 180 points select one to two (1-2) contemporary issues in modern police operations and examine the related law enforcement agencies, change, and efficiency.

Banks offer services such as checking and savings accounts. what do banks do with most of the money they receive in deposits from customers? a) they loan it out to other customers. b) they spend it on new banks in other places. c) they keep it in a locked, secured vault in the bank. d) they send it to the federal reserve in washington, d.c.

It is widely assumed that people need to engage in intellectual activities such as solving crossword puzzles or mathematics problems in order to maintain mental sharpness as they age. in fact, however, simply talking to other people—that is, participating in social interaction, which engages many mental and perceptual skills—suffices. evidence to this effect comes from a study showing that the more social contact people report, the better their mental skills. which of the following, if true, most seriously weakens the force of the evidence cited? (a) as people grow older, they are often advised to keep exercising their physical and mental capacities in order to maintain or improve them. (b) many medical conditions and treatments that adversely affect a person's mental sharpness also tend to increase that person's social isolation. (c) many people are proficient both in social interactions and in solving mathematical problems. (d) the study did not itself collect data but analyzed data bearing on the issue from prior studies. (e) the tasks evaluating mental sharpness for which data were compiled by the study were more akin to mathematics problems than to conversation.