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Is changed or has changed?

Both "is changed" and "has changed" can be correct depending on the context. "Is changed" is typically used when referring to the current state of something, while "has changed" is used when talking about a change that occurred in the past with a connection to the present.


What is hydrosphere?

The hydrosphere contains all of Earth's bodies of water, such as an ocean, lake, sea, river, stream, etc. However, they do not include precipitation (rain, sleet, snow, hail, etc) since that comes from the atmosphere.Hydrosphere is the combined mass of water found on, under and over the surface of the planet.


How can ice cores be used to be determine past climates?

Ice cores contain evidence of past climates in the form of air bubbles, isotopes of water and gases, and dust particles. By analyzing these elements, researchers can reconstruct past temperature variations, atmospheric composition, and even volcanic events. The depth of the ice core also provides a timeline stretching back thousands of years, allowing for a detailed study of how climate has changed over time.


Is it true that the processes that changed earth in the past are different from the processes that operate in the present?

Some processes that changed the Earth in the past, like plate tectonics and volcanic activity, still operate today. However, the rates and intensities of these processes may have varied over geological time. Other processes, such as impact events or specific climate conditions, may have been more prominent in the past compared to their current significance.


Is the following sentence true or false it is very difficult for scientists to learn about earths past environments by studying fossils?

False. Scientists can learn a lot about Earth's past environments by studying fossils. Fossils provide valuable information about past climates, ecosystems, and the evolution of life on Earth. By studying fossils, scientists can reconstruct past environments and gain insights into how they have changed over time.