Lithosphere plastic deformation. The concept of the lithosphere as Earth’s strong outer layer was described by A.E.H. Love in his 1911 monograph "Some problems of Geodynamics" and further developed by Joseph Barrell, who wrote a series of papers about the concept and introduced the term "lithosphere". The concept was based on the presence of significant gravity anomalies over continental crust, from which he inferred that there must exist a strong, solid upper layer (which he called the lithosphere) above a weaker layer which could flow (which he called the asthenosphere). These ideas were expanded by Reginald Aldworth Daly in 1940 with
This Is What the Truth Feels Like few weeks before its release. The seventh track, "Send Me a Picture", has dancehall elements, and was described as a sexting ode by several publications; furthermore, Mapes stated the song has a "Bieber-hits-the-islands vibe", while Annie Zaleski of "The A.V. Club" summarized its meaning as "captur[ing] the delicious anticipation of a crush potentially texting a snap". "Red Flag" begins with "an intro that sounds like a melting violin", followed by Stefani scorning her ex: "This is what happens when you don't listen to what your mother say." Amanda Dykan of AltWire found it reminiscent of 2000's "Ex-Girlfriend" and compared Stefani's