pub fn micrometeorite_overturn_rate_mm_myr(flux_index: f64) -> f64 {
0.7 + 1.8 * flux_index.max(0.0)
}
pub fn space_weathering_index(exposure_myr: f64, solar_wind_factor: f64) -> f64 {
(1.0 - (-exposure_myr / 130.0).exp()) * solar_wind_factor.max(0.0)
}
pub fn volcanic_resurfacing_rate_m_yr() -> f64 {
0.01
}