Final answer:
The greenhouse effect and volcanism are the two features responsible for high temperatures on Venus.
Step-by-step explanation:
The two features responsible for high temperatures on Venus are the greenhouse effect and volcanism. Venus has a thick atmosphere composed mainly of carbon dioxide (CO₂) which acts as a greenhouse gas, trapping heat and causing a runaway greenhouse effect. The planet also experiences widespread volcanism, with volcanic eruptions renewing the surface and generating a fresh surface. These volcanic activities contribute to the high temperatures on Venus.