Answer:
There are different phases of railroad expansion with the innovations in technology.
Explanation:
Few of the technological innovations are described below that leads in railroad expansion more rapid.
1. Centralized Traffic control (CTC) is introduced in 1960's that is used to control the traffic on railroads using different signal control.
2. In 1990's after computer technology involvement, railway ticket and reservation system is automate and being centralized. That makes the railroad expansion improve.
3. Bullet train technology has been introduced, that makes the railway trains more faster.
4. Electric trains has been introduced to use green energy and reduce the dependency on the fuel to make environment clean and green.
Answer: Something people can change and share. It is usually given the bad name of have a bunch of fake information and bugs. Wikipedia is a good example of an open source website but it is not a program.
Explanation: An open source program is a program where you have free rein to basically do whatever you want to it.
Intranet is the answer to this question.
Google definition: An intranet is a network based on TCP/IP protocols (an internet) belonging to an organization, usually a corporation, accessible only by the organization's members, employees, or others with authorization.
I think the correct answer from the choices listed above is option D. It would be plate tectonics that is powered by energy from Earth's interior since it is the only choice that is underneath the surface of the Earth. Hope this answers the question. Have a nice day.
