Formulas in chalk on a blackboard in the form of abstractionFormulas in chalk on a blackboard in the form of abstraction
Congratulations on the new year and christmas with chalk on the blackboardCongratulations on the New Year and Christmas with chalk on the blackboard
Illustration of words in different fonts written in chalk on a blackboardIllustration of words in different fonts written in chalk on a blackboard
The picture should work on a light blue backgroundThe picture should work on a light blue background
A famous scientist at the blackboard with formulasA famous scientist at the blackboard with formulas
Мягкий белый известняк, употр. для окраски, писания и т. п.. Неглубокое место в реке, озере, море.