The most widely accepted theory is that the dinosaurs were annihilated by a comet or asteroid impact that produced abrupt environment shifts and mass extinctions. Some scientists believe that a 6-mile-wide asteroid hit what is now the Yucatan Peninsula in Mexico, creating the Chicxulub crater.

Deccan Traps Theory

The theory also proposes that the extinctions were caused by the massive volcanic eruptions that created the Deccan Traps in modern India. The eruptions emitted large quantities of sulfur dioxide, ash, and dust, which blocked sunlight and triggered significant cooling.

Climate Change Theory

This theory suggests that climate change, possibly linked to the massive volcanic eruptions, caused the mass extinction. The long-term effects of greenhouse gas emissions and volcanic activity contributed to rising temperatures and sea levels, altering ecosystems.

Disease and Infection Theory

This hypothesis suggests that infectious diseases, such as those affecting the respiratory or digestive systems, spread among dinosaurs and other organisms, resulting in their demise. Diseases may have been transferred through direct contact, water, or air.

Sea-Level Changes Theory

Large-scale changes in sea level could lead to the destruction of habitats and food chains, as well as the isolation of dinosaur populations and disruption of their reproductive patterns.

Predators and Competitors

According to this theory, new species of predators and competitors contributed to the extinction of certain dinosaur species by consuming their eggs or competing for resources like food and habitat.

Multiple Factors Theory

Many experts believe that a combination of factors played a role in the dinosaurs' extinction, such as asteroid/comet impact, volcanic activity, climate change, sea-level fluctuations, and competition from other species.