5 billion in the present . at last count more than 6 billion and growing
The key to the past is the present.
The principle of uniformitarianism states that the same geologic processes we see today have been at work throughout Earth's history, allowing us to interpret past geological events based on present-day observations. This idea is summarized by the phrase "the present is the key to the past."
"The present is the key to the past" is a fundamental concept in the field of geology called uniformitarianism. It suggests that the same natural processes that occur today have also occurred in the past to shape Earth's surface and geological features. This principle allows geologists to interpret the Earth's history based on observable processes happening in the present.
A scientist who studies rocks and the Earth's structure is called a geologist. Geologists analyze the composition, structure, and history of rocks to understand processes like plate tectonics and Earth's geological history. They also study how rocks form and change over time to learn more about the Earth's past and present.
The past condition of the Earth has varied greatly over its history, including periods of extreme heat, ice ages, and mass extinctions. Different geological eras have been characterized by distinct climates, land formations, and life forms. Studying Earth's past can provide insights into the planet's evolution and help us understand current environmental changes.
The element "Oxygen".
relating to or being a study (as of a disease) that starts with the present condition of a population of individuals and collects data about their past history to explain their present condition
"Been" is the past participle of the verb "be," used to indicate a state or condition that was present in the past.
past: I was; you were; he/she/it was present: I am; you are; he/she/it is
There is a past, present, and future. There was a past; there is a present and there will be a future.
Have is present tense. The past tense is had.
what is present past
Past - was Present - is Future - will be
Present - am. Past - was and were.
past: I did, you did, he/she/it did; present: I do, you do, he/she/it/does
It depends with the routine of the state or responsibility but normally it changes.some time passed won't reflect present condition
The main principle linked to the palaeoenvironment of the Earth (ie the Earths past) is called the principle of uniformitarianism: "The present is the key to the past" This means that all processes which occur on Earth at the present day, ie erosion, transportation, deposition, weathering, metamorphism etc. also occured at any point in the Earth's history in exactly the same way. Hope this helps :)