Significant coastline changes in China during 1991-2015 tracked by Landsat data

Continental MarginsContinental margins are the edges of continents that meet the ocean. They include three main parts: the continental shelf, the continental slope, and the continental rise. The continental shelf is a shallow, flat area near the coast. The continental slope is steeper and leads down to the deep ocean. The continental rise is where sediments build up at the bottom of the slope. Tectonic activity, ocean currents, and the movement of sediments shape these features. Some...

Protecting ShorelinesShorelines are constantly changing because of erosion, deposition, storms, and rising sea levels. Waves can wear away beaches and cliffs, threatening homes, roads, and natural habitats near the coast. To slow down or prevent this damage, people use different methods to protect shorelines. These include hard structures like breakwaters, seawalls, and groins, which block or redirect wave energy, and soft methods like planting vegetation or adding sand to beaches. Choosing the...

Cenozoic Plate TectonicsThe Earth's surface is always changing. The Cenozoic Era, which began about 66 million years ago and continues today, has been a time of major changes in Earth's land and oceans. Large pieces of Earth's crust, called tectonic plates, have moved to form mountains, shifting continents and opening new ocean basins. These movements have shaped the world as we know it.During the Cenozoic, the continents moved into their current positions. Mountain ranges like the Himalayas...

GIS manipulation and analysis functions are vital for decision-making and planning. These activities range from data retrieval tasks, such as selecting information based on specific criteria, to advanced analytical techniques that address complex spatial problems.One critical GIS analysis method is overlaying, which combines multiple data layers to examine impacts. For example, overlaying a river-dammed lake boundary with road networks can identify affected infrastructure. Another common...

Precambrian ContinentsThe Precambrian period is the longest chapter in Earth’s history, covering almost 88% of the planet’s past. It started about 4.6 billion years ago, when Earth first formed, and lasted until around 541 million years ago. Back then, the world looked very different. There were no plants, no animals, and no oceans like we see today. The first continents started taking shape as molten rock cooled and hardened. These landmasses were small, unstable, and constantly changing...

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.