SAN DIEGO – A Tierrasanta teenager severely beat her 60-year-old mother after she refused to take her surfing, and doctors give the woman a 50 percent chance of survival, a prosecutor told a Superior Court judge Wednesday.

The details came to light during the arraignment of Jillian Alisha Stokes, 18, on felony charges of aggravated mayhem, torture and battery causing great bodily injury.

About 1 p.m. Monday, Stokes and her mother, Bonnie Lynn Spector, got into a shoving match and the mother fell onto the driveway of their home on Zorita Court, near Rueda Drive, authorities previously said.

Stokes then repeatedly kicked her mother in the head and upper body, rendering her unconscious, prosecutor Rick Clabby told Judge David Szumowski.

A neighbor spotted Spector lying on the ground and the daughter inside the open garage. Paramedics eventually arrived and transported the woman to the hospital, Clabby said.

An exposed portion of the woman’s torso was sunburned, indicating she may have been lying in the driveway for a while, the prosecutor told the court.

Spector remains hospitalized and unconscious as doctors treat her for a swollen brain, the prosecutor said. If the mother dies, Stokes may face a murder charge, Clabby said.

“We are waiting to see what happens to her,” Clabby said in an interview.

Stokes has no criminal record and investigators have begun checking to see if she has a history of mental illness.

The teenager remains held on $500,000 bail at the women’s jail in Santee. If convicted, she faces a sentence of 16 years to life in prison, Clabby said.

Oceans once bathed Venus, and continents once shifted on its surface, suggests a spacecraft map released Tuesday. Today, Venus endures 800-degree temperatures and sulfuric acid rains. But a Venus Express spacecraft map of the planet’s surface released by European Space Agency scientists suggests granite covers its southern highlands, which means that the weather there was once balmier.

“If there is granite on Venus, there must have been an ocean and plate tectonics in the past,” says study chief Nils Müller of the University Münster and DLR Berlin, in a statement. In a Journal of Geophysical Research report, the study team suggests that heat signatures given off by the nighttime surface on southern Venus confirm the granite finding. Granite only forms on Earth when volcanic rocks are pulled beneath ocean floors by continental drift, and then return to the surface.

Such a process may have happened on Venus, before its atmosphere heated to its current temperatures. “This is not proof, but it is consistent. All we can really say at the moment is that the plateau rocks look different from elsewhere,” adds Müller. The team suggests future Venus landers aim for the granite regions to confirm the finding.

Mark Occhilupo has won the second heat of the “Clash of the Icons” against surfing legend Tom Curren, at Supertubes, Jeffreys Bay, South Africa.

Occy took the victory with a total of 13.67 points.

The “Clash of the Icons” ended in a draw.

The rivalry between Mark Occhilupo and Tom Curren has 26 years, but the two surfers had a really great time surfing together at Jeffreys Bay.